For me, the 9-5 routine every single week is a toxic grind, with weekends off and all. My preferred work routine covers about the same hourly total, but it's basically three weeks on nonstop, one week off to recuperate and relax and do other things.
This is clearly not for everyone, but I think it has some similarities to how our ancestors lived. Say you're a Polar Inuit, and the caribou are migrating. You hunt caribou around the clock, then relax, store the product, take it easy for a while. Say you're a simple farmer, and it's harvest time, or planting time - you work around the clock to bring in the harvest/plant the crop, then take it relatively easy for a while.
In the modern world, if you're working on something complicated, there's this 'loading time' factor just to get the situation into your head. If it takes a few hours to get up to speed, and you have to do that every day, it's just wasted time. Get up to speed, work straight through with it all in your head, get some food and sleep, and the next day - you're still up to speed. This is far more productive (for complex work) than the awful 9-5 routine, and weekends surrounded by crowds of people are not that great, either. Much better to have a whole week off afterwards.
Where this goes off the rails is when some boss says, no, you don't get that week off, I need you to work like a slave every single week. This is a problem with the hierarchical nature of most modern human societies, and typically said boss is out at 2:00 every day for that important golf game where the important deals are made and the important cocktails are drunk, can't miss that. The construction boss who shows up at the site to 'oversee' for an hour or two is the classic example of this.
In our current society, the only real option for this kind of approach appears to be self-employment, which has a whole other set of problems.