Better safe than sorry. Count on 2 hours before. We have flown out of PVD numerous times and yes, sometimes we are at our gate in 1/2 hour, but other times, like the one we were picked for random search along with 6 people in front of us who looked as if they had packed their entire life in their suitcases, we barely made our flight!! I would rather hang out in the airport for an extra hour than stress out about missing my flight. There is also the chance you will get stuck in traffic or an get behind an accident, which also happened to us before.