Not the first study, and they all largely report the same results: https://www.nature.com/articles/s41562-025-02259-6 https://www.nature.com/articles/s41562-02

Not the first study, and they all largely report the same results: https://www.nature.com/articles/s41562-025-02259-6 https://www.nature.com/articles/s41562-025-02259-6 https://www.theguardian.com/money/2019/feb/19/four-day-week-trial-study-finds-lower-stress-but-no-cut-in-output https://www.theguardian.com/money/2019/feb/19/four-day-week-... https://www.4dayweek.com/research https://www.4dayweek.com/research