diff --git a/src/components/usage/ModelStatsCard.tsx b/src/components/usage/ModelStatsCard.tsx
index 71ad330..cfa34dc 100644
--- a/src/components/usage/ModelStatsCard.tsx
+++ b/src/components/usage/ModelStatsCard.tsx
@@ -1,17 +1,15 @@
 import { useState, useMemo } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Card } from '@/components/ui/Card';
-import { formatCompactNumber, formatUsd } from '@/utils/usage';
+import {
+  formatCompactNumber,
+  formatDurationMs,
+  formatUsd,
+  type ModelStatsSummary,
+} from '@/utils/usage';
 import styles from '@/pages/UsagePage.module.scss';
 
-export interface ModelStat {
-  model: string;
-  requests: number;
-  successCount: number;
-  failureCount: number;
-  tokens: number;
-  cost: number;
-}
+export type ModelStat = ModelStatsSummary;
 
 export interface ModelStatsCardProps {
   modelStats: ModelStat[];
@@ -19,7 +17,14 @@ export interface ModelStatsCardProps {
   hasPrices: boolean;
 }
 
-type SortKey = 'model' | 'requests' | 'tokens' | 'cost' | 'successRate';
+type SortKey =
+  | 'model'
+  | 'requests'
+  | 'tokens'
+  | 'cost'
+  | 'successRate'
+  | 'averageLatencyMs'
+  | 'totalLatencyMs';
 type SortDir = 'asc' | 'desc';
 
 interface ModelStatWithRate extends ModelStat {
@@ -48,7 +53,15 @@ export function ModelStatsCard({ modelStats, loading, hasPrices }: ModelStatsCar
     const dir = sortDir === 'asc' ? 1 : -1;
     list.sort((a, b) => {
       if (sortKey === 'model') return dir * a.model.localeCompare(b.model);
-      return dir * ((a[sortKey] as number) - (b[sortKey] as number));
+      const left = a[sortKey];
+      const right = b[sortKey];
+      const leftValid = typeof left === 'number' && Number.isFinite(left);
+      const rightValid = typeof right === 'number' && Number.isFinite(right);
+
+      if (!leftValid && !rightValid) return 0;
+      if (!leftValid) return 1;
+      if (!rightValid) return -1;
+      return dir * (left - right);
     });
     return list;
   }, [modelStats, sortKey, sortDir]);
@@ -95,6 +108,27 @@ export function ModelStatsCard({ modelStats, loading, hasPrices }: ModelStatsCar
                       {t('usage_stats.tokens_count')}{arrow('tokens')}
                     </button>
                   </th>
+                  <th
+                    className={styles.sortableHeader}
+                    aria-sort={ariaSort('averageLatencyMs')}
+                  >
+                    <button
+                      type="button"
+                      className={styles.sortHeaderButton}
+                      onClick={() => handleSort('averageLatencyMs')}
+                    >
+                      {t('usage_stats.avg_time')}{arrow('averageLatencyMs')}
+                    </button>
+                  </th>
+                  <th className={styles.sortableHeader} aria-sort={ariaSort('totalLatencyMs')}>
+                    <button
+                      type="button"
+                      className={styles.sortHeaderButton}
+                      onClick={() => handleSort('totalLatencyMs')}
+                    >
+                      {t('usage_stats.total_time')}{arrow('totalLatencyMs')}
+                    </button>
+                  </th>
                   <th className={styles.sortableHeader} aria-sort={ariaSort('successRate')}>
                     <button
                       type="button"
@@ -131,6 +165,10 @@ export function ModelStatsCard({ modelStats, loading, hasPrices }: ModelStatsCar
                       </span>
                     </td>
                     <td>{formatCompactNumber(stat.tokens)}</td>
+                    <td className={styles.durationCell}>
+                      {formatDurationMs(stat.averageLatencyMs)}
+                    </td>
+                    <td className={styles.durationCell}>{formatDurationMs(stat.totalLatencyMs)}</td>
                     <td>
                       <span
                         className={
diff --git a/src/components/usage/RequestEventsDetailsCard.tsx b/src/components/usage/RequestEventsDetailsCard.tsx
index 5eb18f8..df10eea 100644
--- a/src/components/usage/RequestEventsDetailsCard.tsx
+++ b/src/components/usage/RequestEventsDetailsCard.tsx
@@ -10,6 +10,7 @@ import type { AuthFileItem } from '@/types/authFile';
 import type { CredentialInfo } from '@/types/sourceInfo';
 import { buildSourceInfoMap, resolveSourceDisplay } from '@/utils/sourceResolver';
 import {
+  extractLatencyMs,
   collectUsageDetails,
   extractTotalTokens,
   formatDurationMs,
@@ -153,12 +154,7 @@ export function RequestEventsDetailsCard({
           toNumber(detail.tokens?.total_tokens),
           extractTotalTokens(detail)
         );
-        const latencyMs =
-          typeof detail.latency_ms === 'number' &&
-          Number.isFinite(detail.latency_ms) &&
-          detail.latency_ms >= 0
-            ? detail.latency_ms
-            : null;
+        const latencyMs = extractLatencyMs(detail);
 
         return {
           id: `${timestamp}-${model}-${sourceRaw || source}-${authIndex}-${index}`,
@@ -480,7 +476,9 @@ export function RequestEventsDetailsCard({
                         {row.failed ? t('stats.failure') : t('stats.success')}
                       </span>
                     </td>
-                    {hasLatencyData && <td>{formatDurationMs(row.latencyMs)}</td>}
+                    {hasLatencyData && (
+                      <td className={styles.durationCell}>{formatDurationMs(row.latencyMs)}</td>
+                    )}
                     <td>{row.inputTokens.toLocaleString()}</td>
                     <td>{row.outputTokens.toLocaleString()}</td>
                     <td>{row.reasoningTokens.toLocaleString()}</td>
diff --git a/src/components/usage/StatCards.tsx b/src/components/usage/StatCards.tsx
index cc87901..145fe96 100644
--- a/src/components/usage/StatCards.tsx
+++ b/src/components/usage/StatCards.tsx
@@ -9,6 +9,7 @@ import {
   IconTrendingUp,
 } from '@/components/ui/icons';
 import {
+  calculateLatencyStatsFromDetails,
   formatCompactNumber,
   formatDurationMs,
   formatPerMinuteValue,
@@ -59,18 +60,18 @@ export function StatCards({ usage, loading, modelPrices, nowMs, sparklines }: St
       tokenBreakdown: { cachedTokens: 0, reasoningTokens: 0 },
       rateStats: { rpm: 0, tpm: 0, windowMinutes: 30, requestCount: 0, tokenCount: 0 },
       totalCost: 0,
-      latencyStats: { averageMs: null as number | null, sampleCount: 0 },
+      latencyStats: { averageMs: null as number | null, totalMs: null as number | null, sampleCount: 0 },
     };
 
     if (!usage) return empty;
     const details = collectUsageDetails(usage);
     if (!details.length) return empty;
 
+    const latencyStats = calculateLatencyStatsFromDetails(details);
+
     let cachedTokens = 0;
     let reasoningTokens = 0;
     let totalCost = 0;
-    let latencyTotalMs = 0;
-    let latencySampleCount = 0;
 
     const now = nowMs;
     const windowMinutes = 30;
@@ -88,14 +89,6 @@ export function StatCards({ usage, loading, modelPrices, nowMs, sparklines }: St
       if (typeof tokens.reasoning_tokens === 'number') {
         reasoningTokens += tokens.reasoning_tokens;
       }
-      if (
-        typeof detail.latency_ms === 'number' &&
-        Number.isFinite(detail.latency_ms) &&
-        detail.latency_ms >= 0
-      ) {
-        latencyTotalMs += detail.latency_ms;
-        latencySampleCount += 1;
-      }
 
       const timestamp = detail.__timestampMs ?? 0;
       if (
@@ -124,10 +117,7 @@ export function StatCards({ usage, loading, modelPrices, nowMs, sparklines }: St
         tokenCount,
       },
       totalCost,
-      latencyStats: {
-        averageMs: latencySampleCount > 0 ? latencyTotalMs / latencySampleCount : null,
-        sampleCount: latencySampleCount,
-      },
+      latencyStats,
     };
   }, [hasPrices, modelPrices, nowMs, usage]);
 
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 24b6e65..fbd8ed3 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -1025,6 +1025,7 @@
     "request_events_result": "Result",
     "time": "Time",
     "avg_time": "Avg Time",
+    "total_time": "Total Time",
     "request_events_empty_title": "No request events",
     "request_events_empty_desc": "No request details are available for the selected time range.",
     "request_events_no_result_title": "No matching events",
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index e837d0e..5ba7a10 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -1028,6 +1028,7 @@
     "request_events_result": "Результат",
     "time": "Время",
     "avg_time": "Среднее время",
+    "total_time": "Общее время",
     "request_events_empty_title": "События запросов отсутствуют",
     "request_events_empty_desc": "Нет деталей запросов для выбранного диапазона времени.",
     "request_events_no_result_title": "Совпадений не найдено",
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index 79e02af..327b67e 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -1025,6 +1025,7 @@
     "request_events_result": "结果",
     "time": "耗时",
     "avg_time": "平均耗时",
+    "total_time": "总耗时",
     "request_events_empty_title": "暂无请求事件",
     "request_events_empty_desc": "当前时间范围内暂无可用的请求明细数据。",
     "request_events_no_result_title": "没有匹配结果",
diff --git a/src/pages/UsagePage.module.scss b/src/pages/UsagePage.module.scss
index 9b55336..fb2941f 100644
--- a/src/pages/UsagePage.module.scss
+++ b/src/pages/UsagePage.module.scss
@@ -596,6 +596,11 @@
   white-space: nowrap;
 }
 
+.durationCell {
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+
 // Pricing Section (80%比例)
 .pricingSection {
   display: flex;
diff --git a/src/utils/usage.ts b/src/utils/usage.ts
index a8a8718..1d02e5a 100644
--- a/src/utils/usage.ts
+++ b/src/utils/usage.ts
@@ -29,6 +29,18 @@ export interface RateStats {
   tokenCount: number;
 }
 
+export interface LatencyStats {
+  averageMs: number | null;
+  totalMs: number | null;
+  sampleCount: number;
+}
+
+export interface DurationFormatOptions {
+  maxUnits?: number;
+  invalidText?: string;
+  secondDecimals?: number | 'auto';
+}
+
 export interface ModelPrice {
   prompt: number;
   completion: number;
@@ -73,6 +85,18 @@ export interface ApiStats {
   >;
 }
 
+export interface ModelStatsSummary {
+  model: string;
+  requests: number;
+  successCount: number;
+  failureCount: number;
+  tokens: number;
+  cost: number;
+  averageLatencyMs: number | null;
+  totalLatencyMs: number | null;
+  latencySampleCount: number;
+}
+
 export type UsageTimeRange = '7h' | '24h' | '7d' | 'all';
 
 const TOKENS_PER_PRICE_UNIT = 1_000_000;
@@ -638,6 +662,13 @@ export function extractTotalTokens(detail: unknown): number {
 export function extractLatencyMs(detail: unknown): number | null {
   const record = isRecord(detail) ? detail : null;
   const rawValue = record?.latency_ms;
+  if (
+    rawValue === null ||
+    rawValue === undefined ||
+    (typeof rawValue === 'string' && rawValue.trim() === '')
+  ) {
+    return null;
+  }
   const parsed = Number(rawValue);
   if (!Number.isFinite(parsed) || parsed < 0) {
     return null;
@@ -645,27 +676,135 @@ export function extractLatencyMs(detail: unknown): number | null {
   return parsed;
 }
 
+interface LatencyAccumulator {
+  totalMs: number;
+  sampleCount: number;
+}
+
+const createLatencyAccumulator = (): LatencyAccumulator => ({
+  totalMs: 0,
+  sampleCount: 0,
+});
+
+const addLatencySample = (
+  accumulator: LatencyAccumulator,
+  latencyMs: number | null | undefined
+): void => {
+  if (latencyMs === null || latencyMs === undefined) {
+    return;
+  }
+  const parsed = Number(latencyMs);
+  if (!Number.isFinite(parsed) || parsed < 0) {
+    return;
+  }
+  accumulator.totalMs += parsed;
+  accumulator.sampleCount += 1;
+};
+
+const finalizeLatencyStats = (accumulator: LatencyAccumulator): LatencyStats => ({
+  averageMs:
+    accumulator.sampleCount > 0 ? accumulator.totalMs / accumulator.sampleCount : null,
+  totalMs: accumulator.sampleCount > 0 ? accumulator.totalMs : null,
+  sampleCount: accumulator.sampleCount,
+});
+
+const trimTrailingZeros = (value: string): string => value.replace(/\.?0+$/, '');
+
+const normalizeDurationMaxUnits = (value: number | undefined): number => {
+  const parsed = Number(value);
+  if (!Number.isFinite(parsed) || parsed <= 0) {
+    return 2;
+  }
+  return Math.min(Math.floor(parsed), 4);
+};
+
+const resolveSecondDecimalPlaces = (
+  seconds: number,
+  secondDecimals: number | 'auto' | undefined
+): number => {
+  if (secondDecimals === 'auto' || secondDecimals === undefined) {
+    return seconds < 10 ? 2 : 1;
+  }
+
+  const parsed = Math.floor(Number(secondDecimals));
+  if (!Number.isFinite(parsed) || parsed < 0) {
+    return seconds < 10 ? 2 : 1;
+  }
+  return Math.min(parsed, 3);
+};
+
 /**
  * 格式化耗时显示
  */
-export function formatDurationMs(value: number | null | undefined): string {
+export function formatDurationMs(
+  value: number | null | undefined,
+  options: DurationFormatOptions = {}
+): string {
+  const invalidText = options.invalidText ?? '--';
+  if (value === null || value === undefined) {
+    return invalidText;
+  }
   const parsed = Number(value);
   if (!Number.isFinite(parsed) || parsed < 0) {
-    return '--';
+    return invalidText;
   }
 
   if (parsed < 1000) {
-    return `${Math.round(parsed)} ms`;
+    return `${Math.round(parsed)}ms`;
   }
 
   const seconds = parsed / 1000;
-  if (seconds < 10) {
-    return `${seconds.toFixed(2).replace(/\.?0+$/, '')} s`;
+  if (seconds < 60) {
+    const secondDecimalPlaces = resolveSecondDecimalPlaces(seconds, options.secondDecimals);
+    return `${trimTrailingZeros(seconds.toFixed(secondDecimalPlaces))}s`;
   }
-  if (seconds < 100) {
-    return `${seconds.toFixed(1).replace(/\.?0+$/, '')} s`;
+
+  const totalSeconds = Math.floor(seconds);
+  let remainingSeconds = totalSeconds;
+  const days = Math.floor(remainingSeconds / 86_400);
+  remainingSeconds -= days * 86_400;
+  const hours = Math.floor(remainingSeconds / 3_600);
+  remainingSeconds -= hours * 3_600;
+  const minutes = Math.floor(remainingSeconds / 60);
+  remainingSeconds -= minutes * 60;
+
+  const parts = [
+    { label: 'd', value: days },
+    { label: 'h', value: hours },
+    { label: 'm', value: minutes },
+    { label: 's', value: remainingSeconds },
+  ].filter((part) => part.value > 0);
+
+  if (!parts.length) {
+    return '0s';
   }
-  return `${Math.round(seconds)} s`;
+
+  return parts
+    .slice(0, normalizeDurationMaxUnits(options.maxUnits))
+    .map((part, index) => {
+      const shouldPad = index > 0 && (part.label === 'm' || part.label === 's');
+      const unitValue = shouldPad ? String(part.value).padStart(2, '0') : String(part.value);
+      return `${unitValue}${part.label}`;
+    })
+    .join(' ');
+}
+
+/**
+ * 从明细列表计算耗时统计
+ */
+export function calculateLatencyStatsFromDetails(details: Iterable<unknown>): LatencyStats {
+  const accumulator = createLatencyAccumulator();
+  for (const detail of details) {
+    addLatencySample(accumulator, extractLatencyMs(detail));
+  }
+  return finalizeLatencyStats(accumulator);
+}
+
+/**
+ * 计算耗时统计
+ */
+export function calculateLatencyStats(usageData: unknown): LatencyStats {
+  return calculateLatencyStatsFromDetails(collectUsageDetails(usageData));
 }
 
 /**
@@ -968,20 +1107,20 @@ export function getApiStats(
 export function getModelStats(
   usageData: unknown,
   modelPrices: Record<string, ModelPrice>
-): Array<{
-  model: string;
-  requests: number;
-  successCount: number;
-  failureCount: number;
-  tokens: number;
-  cost: number;
-}> {
+): ModelStatsSummary[] {
   const apis = getApisRecord(usageData);
   if (!apis) return [];
 
   const modelMap = new Map<
     string,
-    { requests: number; successCount: number; failureCount: number; tokens: number; cost: number }
+    {
+      requests: number;
+      successCount: number;
+      failureCount: number;
+      tokens: number;
+      cost: number;
+      latency: LatencyAccumulator;
+    }
   >();
 
   Object.values(apis).forEach((apiData) => {
@@ -998,6 +1137,7 @@ export function getModelStats(
         failureCount: 0,
         tokens: 0,
         cost: 0,
+        latency: createLatencyAccumulator(),
       };
       existing.requests += Number(modelData.total_requests) || 0;
       existing.tokens += Number(modelData.total_tokens) || 0;
@@ -1013,9 +1153,10 @@ export function getModelStats(
         existing.failureCount += Number(modelData.failure_count) || 0;
       }
 
-      if (details.length > 0 && (!hasExplicitCounts || price)) {
+      if (details.length > 0) {
         details.forEach((detail) => {
           const detailRecord = isRecord(detail) ? detail : null;
+          const latencyMs = extractLatencyMs(detailRecord);
           if (!hasExplicitCounts) {
             if (detailRecord?.failed === true) {
               existing.failureCount += 1;
@@ -1024,6 +1165,8 @@ export function getModelStats(
             }
           }
 
+          addLatencySample(existing.latency, latencyMs);
+
           if (price && detailRecord) {
             existing.cost += calculateCost(
               { ...(detailRecord as unknown as UsageDetail), __modelName: modelName },
@@ -1037,7 +1180,20 @@ export function getModelStats(
   });
 
   return Array.from(modelMap.entries())
-    .map(([model, stats]) => ({ model, ...stats }))
+    .map(([model, stats]) => {
+      const latencyStats = finalizeLatencyStats(stats.latency);
+      return {
+        model,
+        requests: stats.requests,
+        successCount: stats.successCount,
+        failureCount: stats.failureCount,
+        tokens: stats.tokens,
+        cost: stats.cost,
+        averageLatencyMs: latencyStats.averageMs,
+        totalLatencyMs: latencyStats.totalMs,
+        latencySampleCount: latencyStats.sampleCount,
+      };
+    })
     .sort((a, b) => b.requests - a.requests);
 }