@Spinybadger I'd think the two hours *is* the margin of tolerance and the number is just calculated using last completion time plus expected travel and they haven't bothered with any rounding.
@Spinybadger Aha, clearly made quite the study :D I've never noticed the gap narrowing. I don't think I'm at your level of expertise!
@bykimbo This is more or less what I assumed. But at this point, I'm more or less a delivery time connoisseur. Noting that some will have 4-hour windows early in the day, while others narrow it down to an hour even at the end of the round.