Here is one small company’s story of moving to a 5 hour workday, and the benefits it brought.
Relatedly, this Washington Post story describes a company called Treehouse (a tech company, no less) and its reasons for moving to a 4 day, 32-hour work week. As one of the company’s investors said:
“The idea that working longer equals working smarter or creating more value is completely false. The most forward thinking and successful companies are realizing that giving employees more time to be creative and connected to other things besides their job creates a better and more productive employee.”