diff --git a/main.go b/main.go
index eaa8a7a..de76fe3 100644
--- a/main.go
+++ b/main.go
@@ -97,6 +97,7 @@ func main() {
 	db.Take(&authConfig, "key = ?", "authorization")
 
 	engine.POST("/v1/*any", func(c *gin.Context) {
+		begin := time.Now()
 		trackID := uuid.New()
 		// check authorization header
 		if !*noauth {
@@ -224,7 +225,7 @@ func main() {
 		if err != nil {
 			log.Println("Failed to read from response tee buffer", err)
 		}
-		go recordAssistantResponse(contentType, db, trackID, resp)
+		go recordAssistantResponse(contentType, db, trackID, resp, time.Now().Sub(begin))
 	})
 
 	// ---------------------------------
diff --git a/record.go b/record.go
index 7cf2ce2..30af0a5 100644
--- a/record.go
+++ b/record.go
@@ -12,11 +12,12 @@ import (
 )
 
 type Record struct {
-	ID        uuid.UUID `gorm:"type:uuid"`
-	CreatedAt time.Time
-	IP        string
-	Body      string
-	Response  string
+	ID          uuid.UUID `gorm:"type:uuid"`
+	CreatedAt   time.Time
+	IP          string
+	Body        string
+	Response    string
+	ElapsedTime time.Duration
 }
 
 func recordUserMessage(c *gin.Context, db *gorm.DB, trackID uuid.UUID, body []byte) {
@@ -62,7 +63,7 @@ type FetchModeUsage struct {
 	TotalTokens      int64 `json:"total_tokens"`
 }
 
-func recordAssistantResponse(contentType string, db *gorm.DB, trackID uuid.UUID, body []byte) {
+func recordAssistantResponse(contentType string, db *gorm.DB, trackID uuid.UUID, body []byte, elapsedTime time.Duration) {
 	result := ""
 	// stream mode
 	if strings.HasPrefix(contentType, "text/event-stream") {
@@ -113,6 +114,7 @@ func recordAssistantResponse(contentType string, db *gorm.DB, trackID uuid.UUID,
 		return
 	}
 	record.Response = result
+	record.ElapsedTime = elapsedTime
 	if db.Save(&record).Error != nil {
 		log.Println("Error to save record:", record)
 		return