Considering there’s laws in Germany that prevents you from working more than 8 hours a day
That’s vastly more complicated, only mostly true and only true for employees, not self-employed people.
So he might not be full of shit in this regard, but he’s clearly full of shitty-hustle-culture-nonsense!
It’s pretty much true for any office worker. They can stay up to 10 hours a day, but only if their average day isn’t longer than 8 hours in a period of 6 months.
Vacation and illness don’t count as a counter measure.
Pretty much everything else has to be approved by government entities.
Maybe he can stay longer, but if he’s the boss he’s even more full of shit if he demands them to break the law, because it is his responsibility to keep track and make sure nobody is working any longer than that.
It’s fines up to 50k for every single violation.