diff --git a/client/c2c_processor.go b/client/c2c_processor.go
index d6829592..e85b375a 100644
--- a/client/c2c_processor.go
+++ b/client/c2c_processor.go
@@ -93,11 +93,11 @@ func (c *QQClient) c2cMessageSyncProcessor(rsp *msg.GetMessageResponse, info *in
 
 func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *incomingPacketInfo) {
 	strKey := fmt.Sprintf("%d%d%d%d", pMsg.Head.GetFromUin(), pMsg.Head.GetToUin(), pMsg.Head.GetMsgSeq(), pMsg.Head.GetMsgUid())
-	if _, ok := c.msgSvcCache.GetAndUpdate(strKey, time.Minute*5); ok {
+	if _, ok := c.msgSvcCache.GetAndUpdate(strKey, time.Hour*5); ok {
 		c.Debug("c2c msg %v already exists in cache. skip.", pMsg.Head.GetMsgUid())
 		return
 	}
-	c.msgSvcCache.Add(strKey, "", time.Minute*5)
+	c.msgSvcCache.Add(strKey, "", time.Hour*5)
 	if info.Params.bool("init") {
 		return
 	}