16 -> 60, 8 -> 300

https://github.com/XTLS/Xray-core/issues/129#issuecomment-757355137

十分感谢 @GleenJi 等协助测试

app/proxyman/inbound/worker.go

@@ -339,7 +339,7 @@ func (w *udpWorker) clean() error {
 	}
 
 	for addr, conn := range w.activeConn {
-		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 8 { // TODO Timeout too small
+		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 300 {
 			delete(w.activeConn, addr)
 			conn.Close()
 		}
@@ -361,7 +361,7 @@ func (w *udpWorker) Start() error {
 	}
 
 	w.checker = &task.Periodic{
-		Interval: time.Second * 16,
+		Interval: time.Minute,
 		Execute:  w.clean,
 	}