I don't know if an adult can do it in an hour, but learning to ride a bike is very useful/freeing.
You would not believe how uncoordinated children are, and how much better you are at using your body a few years after it finishes growing and you've had some time to get used to it.
(I mean, developing proper instincts about stopping and turning can take some time, but just mastering going slow and not falling down isn't too hard.)