This article hits pretty close to home.  My main hours where I’m “on” are about 10-1, and 3-6.  When are your ‘good hours’ of the day?

While you may be at work longer or at different times try to keep your main projects scheduled for when you’re firing on all cylinders as it were.

http://www.thesimpledollar.com/2011/06/04/good-hours-not-more-hours/