I upvoted this, because I think it's definitely a good way to stay focused (and I should be doing a better job of it, too). but the issue with his analogy is that brushing your teeth is fairly routine. you go about it at pretty much the same time every day, and you don't have to think about it.

working on your idea, however, is different each and every day. some days, the challenges are greater. some days you may need more than 30 minutes.

point taken though, and I'll be trying harder to stick to it.