At the risk of outing myself as "sometimes unproductive," I have found this to not be the case at all. I had a really clear example a number of years ago where

At the risk of outing myself as "sometimes unproductive," I have found this to not be the case at all. I had a really clear example a number of years ago where I had been working full-time, but changed things up from salaried to strictly hourly and started coming in exactly six hours a day instead of eight to "however long it took" hours. It made a remarkable difference -- I arrived rested and with most of the things that can be distractions (errands, paying bills, dealing with other personal issues) already taken care of. I was able to get down to work and focus hard for six hours, and my own productivity on the project increased. It was kind of surprising actually. I doubt I'm the only programmer who ever experienced something like this.