I like to ride my bike, and I have a velodrome nearby. The velo is a nice change from road riding. You can just ride, no pot holes, no parked cars, no soccer mums, no tassle wearing motorcyclists.
My best ever on the velo is 32.5 kmh (20.2mph) avg over an hour and the fastest I have ever seen flashed on the bike computer is 46kmh (28.6 mph). If I come home with a 30kmh hour on the clock, I very happy. I think with a rigid training regime and no beer, I could lift this to 33 or 34 kmh. Once, maybe.
Jens Voight, 43 years old, retiring Tour De France rider, has just a world record of 51.11kmh (31.8mph) avg over an hour on a velodrome.
An hour is a very long time.