I was reading the following from here:

Thirty two days in a row without a day off. Not because of mismanagement — my managers are great — or institutional malfeasance, but because I personally believe in trying to create things that make life better for other developers. I might not always succeed, but I’ll be damned if I’ll let anyone take away the joy of trying.

But for the moment, I’ll rest. See y’all at WWDC. 18 days…

I can tell you without a doubt that this is mismanagement. If it’s intentional or not, that’s another question. If I knew an engineer I manage was working through weekends, I would immediately tell them to stop. If this continued I would give them an informal warning. 32 days without a break can easily lead to burn out. But beyond burnout it sets the wrong example in a team. If a manager is okay with that behaviour, it means they implicitly sponsor it.