Ask news.yc: Are you organized about how many hours you hack?
When working on a project/idea do you schedule your hacking time or do you hack when you feel like it?
How many hours of hacking a week?
How many hours of hacking a week?
Otherwise, scheduling is a very good idea for different reasons. If it's a personal project, which means there's no one else to goad you into working on it, then it's especially important to use scheduling to help you keep working. Remember what PG says about personal projects: Always produce. Do something everyday.
I started doing that "don't break the chain" thing. I would say I can spend around 18 hours a week on the project.