I know what you mean, but if it helps, toon boom gets things done fast and you could work on it for 10 minutes a day and you would still have a decent amount of stuff done. But your right, animation is for people who have a lot of free time, at least an 5 hours a week. But if you are interesting in helping with Zim's return, there is a different group who is trying to bring zim back and you can help by storyboarding, animating, voice acting, or just cheering them on. They are IZFAS
http://s3.zetaboards.com/IZFAS/index/Or you could just sit back and watch the episodes ^^