The highest ranked countries are also the fastest growing. When I was in my 20's we worked M-S in the industry I was in. Today, we celebrate a M-Thr work week. Time is going to tell as to how sustainable this may be from a long-term economic and productivity standpoint. I'm well aware of the arguments for a 4 day work week, and I often adopt that schedule. Nevertheless, I have my doubts about it.