diff --git a/domain/model/group_m/mic.go b/domain/model/group_m/mic.go
index b33508bd542b3f100c1c7a0f270c52b2498b3cb0..25e340317ec1cf76814e7b23b28f211a724c92bb 100644
--- a/domain/model/group_m/mic.go
+++ b/domain/model/group_m/mic.go
@@ -98,8 +98,8 @@ func GetMicNumType(model *domain.Model, groupUuid string) (group_e.GroupMicNumTy
 	}
 }
 
-//6个小时
-const expireMinute = 60 * 60 * 12
+// 3天
+const expireMinute = 60 * 60 * 24 * 3
 const micExpire = expireMinute * time.Second
 
 //麦位基本信息。