this would be fine for factory work, but I don't think it would be effective for knowledge work where most people can only consistently grind out maybe 3-5 hour

this would be fine for factory work, but I don't think it would be effective for knowledge work where most people can only consistently grind out maybe 3-5 hours of "real" work in terms of coding/writing/whatever. I think this is pretty commonly acknowledged on HN that nobody is grinding out 8 hours of hardcore coding every day Working 4 days for 10 hours is going to result in reduced output for the company, but better for the individual who wants to work on their side project with a fresh mind 3 days per week. I'd love it as an employee. Other obvious issue is that the rest of the world is pretty much working 5 days, so you risk losing deals and delaying all sorts of stuff over weekends and things like that