[harryf]

In my experience people who work long hours are often too tired to be objective about the quality of the work they are delivering or their own efficiency .

It's worth watching this talk from the Leading @ Google series - https://www.youtube.com/watch?v=tke6X2eME3c

The short version is, despite the information-age, we still think about this stuff in an industrial-age terms; that productivity is directly proportional to time spent. In fact it's highly non-linear for most forms of information-age value creating activitie.

[ukigumo]

I agree with you completely. Even our work schedules are still based on the mandated daylight times which were created so that factories wouldn't have to keep their lights on for too long.