What is the distance in miles between Buffalo NY and durham NH?

506 miles taking this route:

1. Follow the New York State THRUWAY (toll road) EAST on I-90 from Buffalo across to Massachusetts, where I-90 continues as the MASSACHUSETTS TURNPIKE (marked by a BLACK PILGRIM HAT) (toll road), towards Boston, at EXIT 21A off the THRUWAY.
2. Continue EAST on I-90 MASSACHUSETTS TURNPIKE (toll) EAST across to I-495 to N.H. - MAINE at EXIT 11; follow signs on the exit ramp to I-495 NORTH to N.H. - MAINE.
3. Take I-495 NORTH up to I-95 NORTH, towards N.H. and Maine.
4. Take I-95 NORTH into New Hampshire, where I-95 continues as the NEW HAMPSHIRE TURNPIKE, which is a TOLL ROAD.
5. Take I-95 NEW HAMPSHIRE TURNPIKE (toll) NORTH to the SPALDING TURNPIKE (signed with a BLUE DOT)/U.S. 4, at LEFT EXIT 4.
6. Take the SPALDING TURNPIKE - NORTH to U.S. 4 WEST to DURHAM at EXIT 6W.
7. Continue on U.S. 4 WEST to DURHAM.