Your “late statistic” is determined by the first delivery not being late. After that, you and your clients can make revisions back and forth until the project is perfect. Beware, after the project clock is more than 24 hours late, the customer can push a cancel button that cancels the order without mutually cancelling it. This cancellation posts an automatic negative review and automatically posts “Cancelled order. Seller failed to deliver on time!” This also doesn’t give you an opportunity to respond to the comment.
During revisions with long time customers, I will let the clock go past 24 hours late. With new customers, I am not so willing to let the clock go past 24 hours late.
I have always treated revisions with alot of priority. Usually turn each revision around in about 0-12 hours. Staying on your feet will help the customer not get frustrated. If you are doing creative custom work, there is a lot of opportunity to make adjustments. It’s not usually about fixing mistakes.