diff --git a/auth.go b/auth.go
index 76a6d79..ef1d098 100644
--- a/auth.go
+++ b/auth.go
@@ -113,5 +113,5 @@ func updateToken() {
 	}
 	// Append access token to access_tokens.json
 	ACCESS_TOKENS = tokens.NewAccessToken(token_list, true)
-	time.AfterFunc(2.16e15, updateToken)
+	time.AfterFunc(1.728e15, updateToken)
 }
diff --git a/main.go b/main.go
index 3bc3dc0..b9a4faf 100644
--- a/main.go
+++ b/main.go
@@ -60,8 +60,8 @@ func init() {
 	} else {
 		nowTime := time.Now()
 		usedTime := nowTime.Sub(stat.ModTime())
-		// update access token 25 days after last modify token file
-		toExpire := 2.16e15 - usedTime
+		// update access token 20 days after last modify token file
+		toExpire := 1.728e15 - usedTime
 		if toExpire > 0 {
 			file, err := os.Open("access_tokens.json")
 			if err != nil {