I squeeze in an hour or two here and there (usually at night after everybody else has gone to sleep). It can take a couple months to finish a game at this pace, but you get through them.
I like the big open-ended RPGs. I feel like I can get in and complete a couple short quests or a tricky combat situation in the short time I have allotted. It makes me feel like I'm always making progress, even if it's slow going. Compared to action games where I feel like the hour I have to play is barely enough time to warm up and play effectively.