Hey - so if you were late, that would eat in to your turnaround time for the next sector so if you were 10 mins late and your next turnaround is 20 mins, it will be cut to 10 mins. You can depart before the end of your turnaround time if you want to by the way. You dont have to wait until the counter gets to 00:00. I hope that makes sense. You have 15 mins +/- grace to be on time so even if you landed 10 mins late, you're still good.