[adkadskhj]

> I don't believe this, and I don't see how it squares with "the number of hours you can be productive is limited."

If i had to guess, i'd say people don't perform well for 8 hours a day. A significant portion of people's butt-in-chair is just that, a butt in the chair. For sake of discussion, lets say only 5 hours of real work is done during that 8 hour stint.

So i think the real question is does 2 hours of side-work before the 8 hour butt-in-chair impact the 5 hours of primary-work? Because if 3 hours are wasted in your 8 hour butt-in-chair, they _might_ not matter where the waste/mental-breaks/whatever are allocated.

Ie, if you mentally need a break from the 2 hours of work, during your butt-in-chair time, perhaps that's a net-wash with other time-wasting behaviors already taking place.

All hypothetical of course. I do know that i've seen numerous studies about how efficient we actually are over 8 hours of butt-in-chair. It's not pretty.