100 years of servitude: ​This year marks the 100th anniversary of the official invention of the weekend. In May 1926, Ford Motor Co reduced the working week from six to five days because it was more efficient.

https://content.time.com/time/specials/packages/article/0,28804,1977881_1977883_1977922,00.html

Now, I think, it's time to go a step further #4DayWeek