[ianmf]

Not a programmer, but I divide my day in something like: First hour: Morning greetings, follow up from previous workday, getting my area organized for whatever I have for the day, check HN and news. Next 3-4 hours before lunch: Tackle the most difficult problem or whatever task I really don't want to do but must. The goal is to have the task initial steps completed (planning/thinking) so I can work on it throughout the week. Next 3 hours: Continue working on the tedious task above or whatever work needs to be completed. Last 1-3 hours: Finishing up tasks that can be completed before day's end.

For personal projects, I dedicate as much time as needed as long as it doesn't hinder my family or fitness time.