diff --git a/switch.go b/switch.go
index c3cb55c..d169b7c 100644
--- a/switch.go
+++ b/switch.go
@@ -93,7 +93,7 @@ func (swi *Switch) checkInReady(ip string, now int64) {
 		dipg.Group[ip].ActiveTime = now
 
 		if dh, ok := dipg.Waitor[ip]; ok {
-			if dh.OverTime(now, 30) > 0 {
+			if dh.OverTime(now, 12) > 0 {
 				delete(dipg.Waitor, ip)
 			} else {
 				return