4 hours 9 minutes.
Nine minutes.
Since a stationary bike doesn't move, there's no way it can travel 20 miles. Now, if you're asking how long it would take to ride twenty miles on a bicycle, it depends on speed, wind, and other factors. Typically a bike maximum speed is about 20 miles per hour. So it would take about an hour to ride 20 miles on a REGULAR moving bicycle.
16
going 60 miles an hour
Depends on the speed your cycling at...
It depends on your average speed
It depends on how fast you are moving. For instance, if you are moving at ten miles per hour, it would take you thirty minutes.
1:02:17
15 minutes.
6 hours
It would take 1.5 hours.
That would depend on how fast you are going.