diff --git a/lib/routes/bilibili/video.ts b/lib/routes/bilibili/video.ts
index 959e919d2b..f149cb7cc9 100644
--- a/lib/routes/bilibili/video.ts
+++ b/lib/routes/bilibili/video.ts
@@ -1,5 +1,6 @@
 import { Route, ViewType } from '@/types';
 import got from '@/utils/got';
+import { parseDuration } from '@/utils/helpers';
 import logger from '@/utils/logger';
 import type { Context } from 'hono';
 import cache from './cache';
@@ -86,6 +87,7 @@ async function handler(ctx: Context) {
                                   {
                                       url: getVideoUrl(item.bvid),
                                       mime_type: 'text/html',
+                                      duration_in_seconds: parseDuration(item.length),
                                   },
                                   ...subtitles,
                               ]
diff --git a/lib/utils/helpers.ts b/lib/utils/helpers.ts
index 3e4e820ea2..63c8ca3a09 100644
--- a/lib/utils/helpers.ts
+++ b/lib/utils/helpers.ts
@@ -46,7 +46,10 @@ export function getSearchParamsString(searchParams: any) {
  * @param {string} timeStr - duration string like "01:01:01" / "01:01" / "59"
  * @returns {number}       - total seconds
  */
-export function parseDuration(timeStr: string) {
+export function parseDuration(timeStr: string | undefined | null): number | undefined {
+    if (!timeStr) {
+        return;
+    }
     const clean = timeStr.trim().replaceAll(/[^\d:]/g, '');
     return clean
         .split(':')