diff --git a/handler/headmaster/headmaster.go b/handler/headmaster/headmaster.go
index 3ef66dc..6404894 100644
--- a/handler/headmaster/headmaster.go
+++ b/handler/headmaster/headmaster.go
@@ -87,7 +87,7 @@ func enterFormatter(msgIn string) string {
 }
 
 func GenRequestFromUsr(from string, question string) []openai.ChatCompletionMessage {
-	if _, ok := histories[from]; !ok || histories_time[from].Add(2*time.Minute).Before(time.Now()) {
+	if _, ok := histories[from]; !ok || histories_time[from].Add(10*time.Minute).Before(time.Now()) {
 		histories[from] = make([]openai.ChatCompletionMessage, 0)
 		histories[from] = append(histories[from], openai.ChatCompletionMessage{
 			Role:    openai.ChatMessageRoleSystem,
@@ -108,7 +108,7 @@ func AppendReplyToHistory(from string, reply string) {
 		Content: reply,
 	})
 	histories_time[from] = time.Now()
-	for len(histories[from]) > 10 {
+	for len(histories[from]) > 20 {
 		histories[from] = histories[from][1:]
 		histories[from][0] = openai.ChatCompletionMessage{
 			Role:    openai.ChatMessageRoleSystem,