週4日勤務で生産性が40%もアップか
確かに４日だけだと思うと、ダラダラしなくなる気はする

Microsoft Japan's 4-day workweek experiment sees productivity jump 40% https://www.cnbc.com/2019/11/04/microsoft-japan-4-day-work-week-experiment-sees-productivity-jump-40percent.html