Great post. Having done this professionally for 10 years being single and now having a business, wife and 2 kids, I couldn't agree more. There are some things that can be done to minimize the reduction in the quality of one's life - once your personal life gets busier. One thing that has worked for me is to just specialize in one sport ( for me it's baseball. ) This gives me months off to recover. Since baseball has such a robust advanced stats model, I can skip watching most games. Much discipline is needed though, to skip over other sports during the year. I also take random days and weeks off, where I don't look at anything. I need to keep my units low, which keeps it close to hobby for me. If I had 30 -50,000 on side like I did 20 years ago, there is no way I would be able to do anything else but analyze data and watch games.
Unfortunately time is limited and without a varied spectrum of experience you will die unsatisfied. This is where investors of the market have it much better than us -as there are many built in days off during the year. I wished I liked stocks.