It kinda depends on which way you go, but if you take interstates 295 and 95, the ride from Kittery (southern end) to Fort Kent (northern end) is usually about 5 1/2 hours, nonstop.
11 hours
Ten.
About 17 hours if you take I-86
Fourty-two.
19 hours to Oregon, 31 hours to Maine.
22 and 1/2 hours
It depends on which city in Maine...but...to the middle of the state is 8 hours 23 mins452.4 mi - I-95 N
6 and 1/2 hours
The one in Oregon is 16 hours. The one in Maine is 42 hours.
Google Maps estimates the driving time as 89 hours.
11hours
Philadelphia to Portland is about 6 and 1/2 hours. Pittsburgh to Bangor is twice that.
On average, 2 days (48 hours), depending on where you start from, where you go to, and how fast you drive.