Renting a car (hopefully) in Boston and heading to Wareham. Can't get the rental until 11 a.m. I've been told I may sit in traffic for up to 3 hours for this drive. Now I'm a little worried that heading back on Sunday I could possibly miss my flight. Drive time says 1 hour but I'd rather be safe than sorry. Flight is at 8:50 a.m. whats the "average" time for this road trip? Thanks!