Civilization work day. Not many people ask themselves, what if the world had evolved with 4 hours workday. There are either supporters and opposers of such idea. So the best course of action is to try it. Here is an empire in Civilization: Call to Power, where the people work four hours per day. The empire is very happy and bring 100 k gold per turn, which can buy 5 of the most expensive buildings, and two of the most expensive units per turn.