Going from NYC to Philadelphia you're blessed with excellent highway all the way.
Considering traffic (which can be brutal at certain times of day,) it should take in the neighborhood of 2 hrs, maybe a little more
to get there.
Google Maps estimates the driving time as 1 hour and 51 minutes.
About 10 hours. 7 to New York, and 3 from New York to Philly
12 hours
About 46 hours.
About 2 hours, but that's not considering additional traffic.
16 hours
about fifteen hours
hour and thirty min
Thirteen.
7 and 1/2 hours
3.5
8 hours and 34 minutes.