When I was at the top of my game, I was doing full time college courses, working 2-4 eight hour shifts a week, playing in a tabletop RPG campaign on Saturdays, GMing another tabletop campaign on Sundays, sporadically updating a webcomic and still occasionally posted in forum role plays. I did it because role playing is what I enjoy the most. When I'm in a good campaign, it's the highlight of the week.

Wouldn't recommend living that life, though. I slept five hours a night and exercised never. I gained 20kg in two years...

But a full time job and role playing? No problem.