diff --git a/Bithumb_minute.py b/Bithumb_minute.py
index ef63c05..f174217 100644
--- a/Bithumb_minute.py
+++ b/Bithumb_minute.py
@@ -632,7 +632,7 @@ class Bithumb_minute(HTS):
             # 10분이 지난 미체결은 취소한다.
             order_log_df = self.cancel_order(order_log_df, order_log_filename, min=10)
             # 한번 매수 후 n분 이후 매수하기 위함
-            check_buy_history = self.check_buy_history(order_log_df, min=60)
+            check_buy_history = self.check_buy_history(order_log_df, min=30)
 
             if isRealTime and not check_buy_history:
                 # 매수 조건