diff --git a/public/js/monitor.js b/public/js/monitor.js
index 152bced6..f02d5b43 100644
--- a/public/js/monitor.js
+++ b/public/js/monitor.js
@@ -30,6 +30,20 @@ function formatTokenNumber(value) {
     return formatNumber(number);
 }
 
+
+function formatAverageMinuteBasis(minutes) {
+    const number = Number(minutes) || 0;
+    if (number <= 0) return '暂无请求数据';
+    if (number >= 24 * 60) return `按 ${formatNumber(number / (24 * 60), 1)} 天有请求时长统计`;
+    if (number >= 60) return `按 ${formatNumber(number / 60, 1)} 小时有请求时长统计`;
+    return `按 ${formatNumber(Math.max(number, 1), 0)} 分钟有请求时长统计`;
+}
+
+function formatAverageDayBasis(days) {
+    const number = Number(days) || 0;
+    return number > 0 ? `按 ${formatNumber(number, 0)} 个有请求日期统计` : '暂无请求数据';
+}
+
 function initMonitorPage() {
     const savedDays = Number(localStorage.getItem('monitorRangeDays')) || 7;
     monitorState.rangeDays = [7, 14, 30].includes(savedDays) ? savedDays : 7;
@@ -106,6 +120,9 @@ function renderMonitorCards(data) {
 
     const totals = data.totals || {};
     const averages = data.averages || {};
+    const averageBasis = data.averageBasis || {};
+    const minuteBasisText = formatAverageMinuteBasis(averageBasis.activeMinutes);
+    const dayBasisText = formatAverageDayBasis(averageBasis.activeDays);
     cards.innerHTML = `
         <div class="monitor-card requests">
             <div class="monitor-card-title">请求数</div>
@@ -126,17 +143,17 @@ function renderMonitorCards(data) {
         <div class="monitor-card tpm">
             <div class="monitor-card-title">平均 TPM</div>
             <div class="monitor-card-value">${formatNumber(averages.tpm, 2)}</div>
-            <div class="monitor-card-sub"><span>每分钟 Token 数</span></div>
+            <div class="monitor-card-sub"><span>${minuteBasisText}</span></div>
         </div>
         <div class="monitor-card rpm">
             <div class="monitor-card-title">平均 RPM</div>
             <div class="monitor-card-value">${formatNumber(averages.rpm, 2)}</div>
-            <div class="monitor-card-sub"><span>每分钟请求数</span></div>
+            <div class="monitor-card-sub"><span>${minuteBasisText}</span></div>
         </div>
         <div class="monitor-card rdp">
             <div class="monitor-card-title">日均 RDP</div>
             <div class="monitor-card-value">${formatNumber(averages.rdp, 2)}</div>
-            <div class="monitor-card-sub"><span>每日请求数</span></div>
+            <div class="monitor-card-sub"><span>${dayBasisText}</span></div>
         </div>
     `;
 }
diff --git a/src/server/handlers/common/retry.js b/src/server/handlers/common/retry.js
index 367d5fb3..6043aa73 100644
--- a/src/server/handlers/common/retry.js
+++ b/src/server/handlers/common/retry.js
@@ -287,15 +287,15 @@ export async function with429Retry(fn, maxRetries, options = {}, legacyOnAttempt
       }
       return await fn(attempt, shouldUseCredits);
     } catch (error) {
-      if (typeof retryOptions.onAttemptFailure === 'function') {
-        retryOptions.onAttemptFailure(error, attempt);
-      }
-
       const status = getStatus(error);
       if (status !== 429 && status !== 503) {
         throw error;
       }
 
+      if (typeof retryOptions.onAttemptFailure === 'function') {
+        retryOptions.onAttemptFailure(error, attempt);
+      }
+
       const hint = getRetryHint(error);
       const errorType = status === 503 ? '503' : '429';
       const modelId = retryOptions.modelId || null;
diff --git a/src/utils/usageStats.js b/src/utils/usageStats.js
index 528ce79f..bbe81bc3 100644
--- a/src/utils/usageStats.js
+++ b/src/utils/usageStats.js
@@ -61,6 +61,8 @@ function normalizeUsage(usage = {}) {
 function createBucket(day) {
   return {
     day,
+    firstSeen: null,
+    lastSeen: null,
     ...emptyTotals(),
     models: {}
   };
@@ -79,7 +81,12 @@ class UsageStatsStore {
       const raw = JSON.parse(fs.readFileSync(DATA_FILE, 'utf8'));
       for (const bucket of raw.buckets || []) {
         if (bucket?.day) {
-          this.buckets.set(Number(bucket.day), bucket);
+          const day = Number(bucket.day);
+          this.buckets.set(day, {
+            ...createBucket(day),
+            ...bucket,
+            models: bucket.models || {}
+          });
         }
       }
       this.prune();
@@ -112,6 +119,8 @@ class UsageStatsStore {
   record({ timestamp = Date.now(), statusCode = 0, model = 'unknown', usage = {}, successCount, failedCount } = {}) {
     const day = startOfUtcDay(timestamp);
     const bucket = this.buckets.get(day) || createBucket(day);
+    bucket.firstSeen = bucket.firstSeen === null ? timestamp : Math.min(bucket.firstSeen, timestamp);
+    bucket.lastSeen = bucket.lastSeen === null ? timestamp : Math.max(bucket.lastSeen, timestamp);
     const normalizedUsage = normalizeUsage(usage);
     const modelName = typeof model === 'string' && model.trim() ? model.trim() : 'unknown';
     const failed = statusCode >= 400 || statusCode === 0;
@@ -185,7 +194,18 @@ class UsageStatsStore {
       }
     }
 
-    const minutes = safeDays * 24 * 60;
+    const activeDailyBuckets = daily
+      .map(item => this.buckets.get(Date.parse(`${item.date}T00:00:00.000Z`)))
+      .filter(bucket => bucket && bucket.requests > 0);
+    const activeDays = activeDailyBuckets.length;
+    const activeMinutes = activeDailyBuckets.reduce((sum, bucket) => {
+      const dayStart = bucket.day;
+      const dayEnd = Math.min(dayStart + DAY_MS, now);
+      const observedEnd = bucket.lastSeen === null ? dayEnd : Math.min(bucket.lastSeen, dayEnd);
+      const observedStart = bucket.firstSeen === null ? dayStart : Math.min(Math.max(bucket.firstSeen, dayStart), dayEnd);
+      const elapsedMs = Math.max(60 * 1000, observedEnd - observedStart);
+      return sum + elapsedMs / (60 * 1000);
+    }, 0);
     const models = Array.from(modelMap.entries())
       .map(([model, stats]) => ({ model, ...stats }))
       .sort((a, b) => b.totalTokens - a.totalTokens || b.requests - a.requests);
@@ -194,9 +214,13 @@ class UsageStatsStore {
       rangeDays: safeDays,
       totals,
       averages: {
-        tpm: totals.totalTokens / minutes,
-        rpm: totals.requests / minutes,
-        rdp: totals.requests / safeDays
+        tpm: activeMinutes > 0 ? totals.totalTokens / activeMinutes : 0,
+        rpm: activeMinutes > 0 ? totals.requests / activeMinutes : 0,
+        rdp: activeDays > 0 ? totals.requests / activeDays : 0
+      },
+      averageBasis: {
+        activeDays,
+        activeMinutes
       },
       models,
       daily,