Studies looking at WW1 and WW2 show that 40 hours a week is optimal. https://www.researchgate.net/publication/262809555_The_Productivity_Of_Working_Hours https:

Studies looking at WW1 and WW2 show that 40 hours a week is optimal. https://www.researchgate.net/publication/262809555_The_Productivity_Of_Working_Hours https://www.researchgate.net/publication/262809555_The_Produ... You can use scihub to get the paper or here's a secondary pop-sci source: https://www.bbc.com/worklife/article/20190912-what-wartime-munitionettes-can-teach-us-about-burnout https://www.bbc.com/worklife/article/20190912-what-wartime-m...