diff --git a/transport/internet/udp/dispatcher_split.go b/transport/internet/udp/dispatcher_split.go
index b7650cd1f..94edf6486 100644
--- a/transport/internet/udp/dispatcher_split.go
+++ b/transport/internet/udp/dispatcher_split.go
@@ -69,7 +69,7 @@ func (v *Dispatcher) getInboundRay(ctx context.Context, dest net.Destination) *c
 		cancel()
 		v.RemoveRay(dest)
 	}
-	timer := signal.CancelAfterInactivity(ctx, removeRay, time.Second*4)
+	timer := signal.CancelAfterInactivity(ctx, removeRay, time.Second*300)
 	link, _ := v.dispatcher.Dispatch(ctx, dest)
 	entry := &connEntry{
 		link:   link,