This would depend, based on the speed at which you are traveling. If you are running at 9 miles per hour, you could run 18 miles in 2 hours, but if you are only running at 3 miles per hour, it would take you 6 hours to run the same 18 mile distance.
It would take Wilma 8 hours to run 40 miles at 5mph.
It depends on how fast you can run and for how long you can sustain that speed.
It is impossible to run that fast, but if it were, it would take 2 hours.
It would take 10 minutes.
Just over 8.5 minutes.
0.73 hours = approx 44 minutes.
37 minutes 12 seconds.
31 minutes 34.73 seconds.
That depends on how long you run for.
It would take 1 hour 14 minutes 30 seconds.
20 minutes. But you would be walking unless you were very small.
About 43 minutes.