Wow, that sounds absolutely brutal. Where is this? A startup in the US?

Quit and find a new job. No tech company worth its salt should be counting hours worked for its developers.

edit: I realized that it wasn't me whom you asked the question, apologies.

Most companies will throw out their employees at the drop of the hat when they feel like it. Is it really worth giving them that much of your time every day? I don't think so.

If you keep this up for the next 10 years, what will you have to say about yourself and your accomplishments?

I dont see anywhere in my employment contract that says my ass needs to be in a seat for a certain amount of hours per week. I just do my best to meet my employment obligations — especially when working from home I can meet those obligations in less than 40 hours per week. If my employer said I needed to work regular overtime or if they demanded I work a very rigid schedule I would just leave and find a job elsewhere. The tech job market in my city is so hot right now I get solicited by recruiters 3-4 times per week, it just isn’t worth it to spend time in a place which doesn’t treat you well.

I'm a contractor working full time on a project. If something is not done after 7 hours of continuous work, it may as well wait for tomorrow as I will be very tired and less than performant. Also mental health. I've been burned out previously and it was not pleasant. I try to separate work and personal life as much as I can (mostly virtually, as I'm working from home). If I had an office space, I would leave my desktop there.