About 20 hours.
20 hours at 60 mph
60 miles.
Probably 15-20 hours nonstop
9 hours 20 minutes.
28 hours and 20 minutes.
40 hours 20 minutes at 60 mph
At an average 60 mph: 28 hours, 20 minutes
49 hours, 20 minutes
10 hours 20 minutes at 60 mph
The time (hours) required to drive 20 miles is (20) / (speed, in miles per hour)
20 minutes at 60 mph