It takes 3 to 4 minutes for an average person, going the average speed of 17 to 18 mph, to bike a mile. On hilly terrain, that rate drops to 6 to 7 minutes per mile. Professionals, such as Tour de France cyclists, bike much faster than the average speed.
On flat terrain, professional cyclists can reach 28 mph, which means they cycle a mile in just over 2 minutes. On hilly terrain, professional riders can maintain as much as 25 mph, equating to just over 3 minutes to complete a mile. Experience and the specifications of the bike also impact the quickness with which a person rides.