diff --git a/backend/src/main/java/org/ftclub/cabinet/user/service/BanPolicyService.java b/backend/src/main/java/org/ftclub/cabinet/user/service/BanPolicyService.java
index f856b75c1..3df7b51f7 100644
--- a/backend/src/main/java/org/ftclub/cabinet/user/service/BanPolicyService.java
+++ b/backend/src/main/java/org/ftclub/cabinet/user/service/BanPolicyService.java
@@ -20,7 +20,7 @@ public BanType verifyBan(LocalDateTime endedAt, LocalDateTime expiredAt) {
 
 	public LocalDateTime getUnBannedAt(LocalDateTime endedAt, LocalDateTime expiredAt) {
 		long recentBanDays = DateUtil.calculateTwoDateDiffCeil(expiredAt, endedAt);
-		double squaredBanDays = Math.pow(recentBanDays, 2);
+		double squaredBanDays = Math.min(Math.pow(recentBanDays, 2), 180);
 		return endedAt.plusDays((long) squaredBanDays);
 	}
 }