I only do about 3-5 hours of work per day, which is mostly just doing research/experiments or QA testing. The rest of my time is just socializing, watching youtube, and going on Reddit.
At my last job, it was a sweatshop manufacturing job in biotech, but realistically we only worked 6 hours/day. 1st hour was mostly just getting everything set up. 1 hour lunch break. Last hour of the day was just looking busy. An experienced worker could put out 1.5-2x as a new worker, but most people quit before reaching that point due to the working conditions and culture. This means an entire team of elite workers could do as much work in half a day and simply go home once they finish a process. They’d get a nice 20 hour work week.
I think life would be better for everyone if we didn’t need to work an arbitrary amount of hours.