If you maintained an average speed of 70 mph, the time to cover 455 miles would be about 6 hours and 30 minutes. You would have to add time for stops, detours and other delays.
One hour
4.57 hours
11 hours 30 minutes.
1hr 25mins
2.814 hours (rounded)
27 minutes.
http://www.wolframalpha.com/input/?i=200+miles+at+70mph
1 and half hours
1 hour 20 minutes.
2 hours 1 minute
7 hours 8 minutes.
at 70mph on the highway it'll take you right at 2hr