One simple way to do this is to have a machine dedicated to integration. 40-Hour Week I want to be fresh and eager every morning, and tired and satisfied every night. On Friday, I want to be tired and satisfied enough that I feel good about two days to think about something other than work. Then on Monday I want to come in full of fire and ideas. Whether this translates into precisely 40 hours per week at the work site is not terribly important.
Different people have different tolerances for work.
One person might be able to put in 35 concentrated hours, another 45. But no one can put in 60 hours a week for many weeks and still be fresh and creative and careful and confident. Don t do that. Overtime is a symptom of a serious problem on the project. For one week, fine, crank and put in some extra hours.