diff --git a/src/main/kotlin/roomescape/payment/infrastructure/client/TosspayClient.kt b/src/main/kotlin/roomescape/payment/infrastructure/client/TosspayClient.kt
index c8ea2652..1a1fdb86 100644
--- a/src/main/kotlin/roomescape/payment/infrastructure/client/TosspayClient.kt
+++ b/src/main/kotlin/roomescape/payment/infrastructure/client/TosspayClient.kt
@@ -29,13 +29,13 @@ class TosspayClient(
         orderId: String,
         amount: Int,
     ): PaymentClientConfirmResponse {
+        val startTime = System.currentTimeMillis()
         log.info { "[TosspayClient.confirm] 결제 승인 요청: paymentKey=$paymentKey, orderId=$orderId, amount=$amount" }
 
         return confirmClient.request(paymentKey, orderId, amount)
             .also {
-                log.info { "[TosspayClient.confirm] 결제 승인 완료: response=$it" }
+                log.info { "[TosspayClient.confirm] 결제 승인 완료: duration_ms=${System.currentTimeMillis() - startTime}ms, paymentKey=$paymentKey" }
             }
-
     }
 
     fun cancel(
@@ -43,10 +43,11 @@ class TosspayClient(
         amount: Int,
         cancelReason: String
     ): PaymentClientCancelResponse {
+        val startTime = System.currentTimeMillis()
         log.info { "[TosspayClient.cancel] 결제 취소 요청: paymentKey=$paymentKey, amount=$amount, cancelReason=$cancelReason" }
 
         return cancelClient.request(paymentKey, amount, cancelReason).also {
-            log.info { "[TosspayClient.cancel] 결제 취소 완료: response=$it" }
+            log.info { "[TosspayClient.cancel] 결제 취소 완료: duration_ms=${System.currentTimeMillis() - startTime}ms, paymentKey=$paymentKey" }
         }
     }
 }