diff --git a/backend/src/controllers/videos.controller.ts b/backend/src/controllers/videos.controller.ts
index 3f84f0d..a6e3e2c 100644
--- a/backend/src/controllers/videos.controller.ts
+++ b/backend/src/controllers/videos.controller.ts
@@ -17,7 +17,7 @@ export async function getAllVideos(req: AuthRequest, res: Response) {
     console.log('[CONTROLLER] pageNum:', pageNum, 'limitNum:', limitNum, 'offset:', offset);
     
     // Build query
-    let whereClause = '1=1';
+    let whereClause = 'v.duration_seconds >= 600';
     const args: any[] = [];
     
     if (channelId) {
diff --git a/backend/src/db/migrate.ts b/backend/src/db/migrate.ts
index 6b63512..93a43be 100644
--- a/backend/src/db/migrate.ts
+++ b/backend/src/db/migrate.ts
@@ -1,4 +1,5 @@
 import { db } from '../config/database.js';
+import { isoDurationToSeconds } from '../utils/duration.js';
 
 const migrations = [
   {
@@ -96,6 +97,44 @@ const migrations = [
       await db.execute(`INSERT OR IGNORE INTO settings (key, value) VALUES ('initial_setup_complete', 'false')`);
       await db.execute(`INSERT OR IGNORE INTO settings (key, value) VALUES ('refresh_in_progress', 'false')`);
     }
+  },
+  {
+    id: 2,
+    name: 'add_duration_seconds',
+    up: async () => {
+      const columnCheck = await db.execute(`
+        SELECT 1 FROM pragma_table_info('videos_cache')
+        WHERE name = 'duration_seconds'
+      `);
+
+      if (!columnCheck.rows.length) {
+        await db.execute(`
+          ALTER TABLE videos_cache
+          ADD COLUMN duration_seconds INTEGER DEFAULT 0
+        `);
+      }
+
+      const videos = await db.execute(`
+        SELECT id, duration
+        FROM videos_cache
+      `);
+
+      for (const row of videos.rows) {
+        const duration = row.duration as string | null;
+        const seconds = duration ? isoDurationToSeconds(duration) : 0;
+        await db.execute({
+          sql: `UPDATE videos_cache
+                SET duration_seconds = ?
+                WHERE id = ?`,
+          args: [seconds, row.id]
+        });
+      }
+
+      await db.execute(`
+        CREATE INDEX IF NOT EXISTS idx_videos_duration_seconds
+        ON videos_cache(duration_seconds)
+      `);
+    }
   }
 ];
 
diff --git a/backend/src/services/cache.service.ts b/backend/src/services/cache.service.ts
index 414aa8a..c0e05b1 100644
--- a/backend/src/services/cache.service.ts
+++ b/backend/src/services/cache.service.ts
@@ -1,5 +1,6 @@
 import { db, getSetting, setSetting } from '../config/database.js';
 import { fetchChannelVideos } from './youtube.service.js';
+import { isoDurationToSeconds } from '../utils/duration.js';
 
 export async function isRefreshInProgress(): Promise<boolean> {
   const value = await getSetting('refresh_in_progress');
@@ -38,15 +39,16 @@ async function updateVideoCache(channelId: string, videos: any[]) {
   
   // Insert new videos
   for (const video of videos) {
+    const durationSeconds = isoDurationToSeconds(video.duration);
     await db.execute({
       sql: `INSERT INTO videos_cache 
             (id, channel_id, title, description, thumbnail_url, 
-             published_at, view_count, like_count, duration)
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+             published_at, view_count, like_count, duration, duration_seconds)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
       args: [
         video.id, channelId, video.title, video.description,
         video.thumbnailUrl, video.publishedAt, video.viewCount,
-        video.likeCount, video.duration
+        video.likeCount, video.duration, durationSeconds
       ]
     });
   }
diff --git a/backend/src/utils/duration.ts b/backend/src/utils/duration.ts
new file mode 100644
index 0000000..bf17f8a
--- /dev/null
+++ b/backend/src/utils/duration.ts
@@ -0,0 +1,18 @@
+export function isoDurationToSeconds(isoDuration: string): number {
+  if (!isoDuration) {
+    return 0;
+  }
+
+  const match = isoDuration.match(/PT(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)S)?/);
+  if (!match) {
+    return 0;
+  }
+
+  const hours = parseInt(match[1] || '0', 10);
+  const minutes = parseInt(match[2] || '0', 10);
+  const seconds = parseInt(match[3] || '0', 10);
+
+  return hours * 3600 + minutes * 60 + seconds;
+}
+
+