Work hours and writing schedules

Screenwriter and author Burton Wohl once told me his writing schedule.

"I write from 9-1, after a good breakfast. Four hours (of writing) is about all I can handle, and I think that's enough. A good breakfast (before starting) is important."

I tried Burton's plan and it works for me, too.

The only thing I'd add is that it has to be seven days a week.