Can't deny that there are some industries where more hours are better and that beyond the 4-5 hour range they don't suffer from diminishing returns. But I'd point to David Graeber here and just say that there seem to be a lot of people out there making themselves look busy for much of the day, and in the process wasting a lot of their lives and needlessly taxing their own emotional states. And together we've tacitly made a decision that this is all OK and normal.