I'm looking at a possible MR to FRA next month, which would return FRA-EWR-PHL. My two options at the "reasonable" price point for the EWR-PHL connection are 1 hr 40 minutes...and 7 hrs 15 minutes, which seems INSANE given that I actually live halfway between EWR and PHL and would only be going back there to get my car, really.

Most of you seem to be in agreement that 1hr 40 mins should be enough for customs/connection for a US citizen without checked baggage...right? (it'll be a Sunday afternoon)