If you maintained an average speed of 70 mph, the time to cover 50 miles would be about 42 minutes and 51 seconds. You would have to add time for stops, detours and other delays.
4.57 hours
One hour
11 hours 30 minutes.
1hr 25mins
2.814 hours (rounded)
27 minutes.
1 and half hours
http://www.wolframalpha.com/input/?i=200+miles+at+70mph
1 hour 20 minutes.
2 hours 1 minute
7 hours 8 minutes.
21 hours, 25 minutes, 42.86 seconds