The most I've worked in my life was a two week intensive effort to reach a deadline. I did little more than work eat and sleep, and yet I only worked 75 and 80

The most I've worked in my life was a two week intensive effort to reach a deadline. I did little more than work eat and sleep, and yet I only worked 75 and 80 hours. And my brain was pretty fried after. This was working from home, with rewarding work I was motivated to do. I don't see how it would be possible to work 95 hours in some office, let alone the 105 hours reported with 5 hours of sleep. It wouldn't make any sense. If you haven't slept more than 5 hours, the other 15 hours (assuming you work Saturday and Sunday) are going to be unproductive. Diminishing returns is a real thing. So, the managers here seems both very unprofessional, and remarkably bad. No one wins, and everyone loses? Nice way to run a business.