I don't know the answer to this one, but it'd be nice if someone could post what a "reasonable" amount of time would be that someone should schedule for all types of connections: domestic-domestic (i.e. SFO-PHL-BOS), domestic-international (i.e. SFO-PHL-FRA), international-domestic (FRA-PHL-SFO), and international-international (FRA-PHL-CUN).