I will probably get somewhere between 4-5 hours of solid "work" out of an 8 hour day. However, the time when I am not heads-down coding, testing, documenting, etc, my brain is able to think about problems that I have been struggling with.

I have lost count of the number of times that a beautiful, simple solution has popped into my head at the most bizarre of moments, because I have been able to let it tick away in the back of my head without much conscience thought to muddy the waters.

Tom