Unless it's actually "your business" and you are a founder, then leaving on Friday after this 80 hour week is ok.

If it's 6pm or 7pm on a Friday and you have worked 80 hours that week, and you need to work more, then you've scheduled something wrong or management has.

And, if you're a founder, who is imparting a culture of leaving to get rest on a Friday evening is not ok, or working 70-80 hour weeks is the norm, then good luck with that culture when people turn resentful.

Respecting yourself and your life and your employees lives while trying to be successful ... that's how it works.

*General "you", not necessarily rsp1984