diff --git a/lib/editor/util/timetable.js b/lib/editor/util/timetable.js
index 9d6a15306..1d17ad97d 100644
--- a/lib/editor/util/timetable.js
+++ b/lib/editor/util/timetable.js
@@ -48,18 +48,14 @@ let alertTimeout
 export function parseCellValue (timeString: string, col: TimetableColumn) {
   const date = moment().startOf('day').format('YYYY-MM-DD')
   const parsedDate = moment(date + 'T' + timeString, TIMETABLE_FORMATS, true)
-
   clearTimeout(alertTimeout)
-
   if (isTimeFormat(col.type)) {
     if (!parsedDate.isValid()) {
-      alertTimeout = setTimeout(() => alert('Please enter a valid time format'), 500)
+      alertTimeout = setTimeout(() => alert('Please enter a valid time format'), 600)
       return null
     }
-
     return moment(date + 'T' + timeString, TIMETABLE_FORMATS).diff(date, 'seconds')
   }
-
   return timeString
 }