diff --git a/src/admin/pages/OfferDetail.tsx b/src/admin/pages/OfferDetail.tsx
index b94bb25..fdb0f14 100644
--- a/src/admin/pages/OfferDetail.tsx
+++ b/src/admin/pages/OfferDetail.tsx
@@ -267,7 +267,7 @@ export default function OfferDetail() {
 
     heartbeatRef.current = setInterval(() => {
       apiFetch(`${API_BASE}/offers/${id}/heartbeat`, { method: 'POST' }).catch(() => {})
-    }, 2 * 60 * 1000) // every 2 minutes
+    }, 10 * 1000) // every 10 seconds
 
     return () => {
       if (heartbeatRef.current) clearInterval(heartbeatRef.current)
diff --git a/src/routes/admin/quotations.ts b/src/routes/admin/quotations.ts
index 9fe6cbe..3b47f78 100644
--- a/src/routes/admin/quotations.ts
+++ b/src/routes/admin/quotations.ts
@@ -17,7 +17,7 @@ import {
   getNextOfferNumber,
 } from '../../services/offers.service';
 
-const LOCK_TIMEOUT_MS = 5 * 60 * 1000; // 5 minutes — lock expires if no heartbeat
+const LOCK_TIMEOUT_MS = 30 * 1000; // 30 seconds — lock expires if no heartbeat
 
 
 export default async function quotationsRoutes(fastify: FastifyInstance): Promise<void> {