Been watching Matt Lowne KSP videos for awhile and have only just realised you live Plymouth way where I grew up (Mutley Plain and Stonehouse). Not only that you but you are cycling through a bit of Central Park where I learned to ride my bike as a kid. Small world.
Idk how long did it take for him to do this and how long is the track but I can cycle 10 km in 30 minutes That's like going 20-30 kmh all the time, sometimes I even go 50 kmh when on a downhill And btw I can do it without any water, I did it many times