I make computer fonts as a hobby.
This hobby costs me nothing to do. I can do it without leaving the house. I can do it at any time of the day or night. I can do it for fifteen minutes when I have nothing better to do, or I can do it for fifteen hours in a row. I can stop doing it for an extended period of time, then resume right where I left off. I only need to use one hand to do it. I could also make some money, if I post my finished work online.
The only other hobby that I can think of which meets all of those conditions is rubbing one out.
This hobby costs me nothing to do. I can do it without leaving the house. I can do it at any time of the day or night. I can do it for fifteen minutes when I have nothing better to do, or I can do it for fifteen hours in a row. I can stop doing it for an extended period of time, then resume right where I left off. I only need to use one hand to do it. I could also make some money, if I post my finished work online.
The only other hobby that I can think of which meets all of those conditions is rubbing one out.