I don't imagine casual use overtime would kill you since my character is kind of based on that, but he has been alive longer than other characters and thus had had more time to practice (+30 years). Honestly I think it's like jogging compared to running. People can jog for longer than they can run but both will eventually tire you out. The more moderation you use the better you become.

This is strictly my opinion though, so if it's different in some way Aeo would know.