I used the same example when my manager said "You only went over 9.5 by 5 min."The language is not vague at all.
9 hours and 31 minutes, is over 9.5
Next Day Air is late.... at 10:31am.
Are you willing to negotiate over this issue ?
-Bug-
I said "Ok as long as I know tomorrow I can deliver air till 10:35 and closed business at 5:05."