- I spend the first part of the project thinking about it and being (apparently) very unproductive. (25-30%)
- After I reach some sort of critical mass in my thinking, I very quickly pour out everything into code/onto the page. The project is 80% done as far as volume goes at this point. (10-20%)
- I spend the rest of the time editing, bugfixing, refining, etc. (50-60%)
This is why it's best for me if I've got some variety in a job. The hyper-productive phase really can't overlap with anything else: if I'm interrupted then, I'll get off track and it may blow the whole day, but in phase 1 or 3 I'm better off not spending all my time focusing on the project, because I'll just end up web surfing. Or blogging.