https://marco.org/2007/10/23/when-i-lived-in-germany-it-was-illegal-to-work
When I lived in Germany, it was illegal to work overtime; if I worked more than 40 hours in a week I had to log that time and take equivalent vacation later. This was strongly enforced because the sense was that you were hurting your fellow workers if you were willing to work overtime.
— P. Sengers (thanks Contrived Chaos)