Originally Posted by JimInOhio

I think it's a bit vague because it "all depends". I've seen INTL flights held at the gate even past scheduled departure time when it's for a connecting passenger. They aren't going to do that for someone who checked in at that airport (in this case, EWR) but will often page him/her before they get ready to close the door. Casual observation tells me they might close the door as early as T-30 if all the expected passengers are on board.