Depends really.
Diamond: Beat the game in 24 hours over the course of 5-6 days. That's like four hours a day. Afterwards it was about two hours a day, and then I play very rarely now. I just don't have the patience like the rest of you to spend weeks breeding for that 3x 31 IV pokemon.
Shoddy: I'd like to be on more, but it got rather dull for me for a bit. I'm taking a break, then I'd like to get back, make a fully functional team (Raikou/Metagross/Heracross team worked well, and I loved the pure offensiveness), then maybe try to make top 100. Before, I'd spend about 1-2 hours a day playing. Though I remember two summers ago I'd spend nearly half a day building teams on Netbattle for fun. Good times.