Here's a bit from today's New York Times about Tracy Kidder's work schedule. You can read the entire piece here. He's known for many books, but the one above -- for which he won the Pulitzer Prize -- is also the one I liked the best.
What is a typical day in your writing life?
I tend to start early in the morning, the time of day when l feel most nearly capable of thought. When I’m writing a rough draft, I have a hard time staying with it for more than a few hours. I used to be able to spend 12 hours or more a day when rewriting, but I can’t do that for many days in a row anymore. In the summertime, I go fishing after writing, for me a lovely antidote to frustration.