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I would start programming mobile games, and would hope to make money from them. If I don't succeed, at least I had a hobby, and maybe can use the experience to get a more interesting job later. If I do succeed, then I do not have to solve the problem of boring job anymore.
That would require sufficient freedom to spend those 3 hours not just programming, but also painting pictures, editing 3D models, editing levels, and testing the game on the phone. Okay, hypothetically that is not necessary; there can be some parts that I have to do at home. But it would be much more convenient if I could do whatever is necessary for the game immediately when I need it.
Or, if I wouldn't have a specific plan, I would just learn random stuff from online universities. I enjoy learning, so I wouldn't necessarily care about how useful are those lessons. I would imagine that some part of that would be useful somehow later, if nothing else, then for impressing people.
Someone who is a buddhist could use those three hours to meditate daily, and achieve nirvana in a few years, while keeping a well-paying job. Also, being a buddhist could help with the feelings of boredom from the job. ;)
Why exactly mobile? From a user angle, it is super hard to fish out the borderline good ones from all the crap in Google Play, the search engine does not really help you find the unpopular good ones amongst the popular crap, so it is mostly from hearsay, and the UI has limitations. I guess I would go for the desktop.