diff --git a/weed/storage/needle/volume_ttl.go b/weed/storage/needle/volume_ttl.go
index 26ce3b8fd..5368beaed 100644
--- a/weed/storage/needle/volume_ttl.go
+++ b/weed/storage/needle/volume_ttl.go
@@ -134,7 +134,7 @@ func (t TTL) Minutes() uint32 {
 	case Week:
 		return uint32(t.Count) * 60 * 24 * 7
 	case Month:
-		return uint32(t.Count) * 60 * 24 * 31
+		return uint32(t.Count) * 60 * 24 * 30
 	case Year:
 		return uint32(t.Count) * 60 * 24 * 365
 	}
@@ -145,5 +145,23 @@ func SecondsToTTL(seconds int32) string {
 	if seconds == 0 {
 		return ""
 	}
-	return fmt.Sprintf("%dm", seconds/60)
+	if seconds/60 < 256 {
+		return fmt.Sprintf("%dm", seconds/60)
+	}
+	if seconds/(3600) < 256 {
+		return fmt.Sprintf("%dh", seconds/(3600))
+	}
+	if seconds/(3600*24) < 256 {
+		return fmt.Sprintf("%dd", seconds/(3600*24))
+	}
+	if seconds/(3600*24*7) < 256 {
+		return fmt.Sprintf("%dw", seconds/(3600*24*7))
+	}
+	if seconds/(3600*24*30) < 256 {
+		return fmt.Sprintf("%dM", seconds/(3600*24*30))
+	}
+	if seconds/(3600*24*365) < 256 {
+		return fmt.Sprintf("%dy", seconds/(3600*24*365))
+	}
+	return ""
 }