[theshrike79]

The point here is that if you know you're stuck at the worksite "until it's done", you'll work at a more manageable pace.

BUT if you know your workday is exactly 8 hours with a 30 minute lunch in the middle, you'll pace yourself differently.

The difference between two equal people doing the same thing, one working until they drop and the other working 8 hours and leaving, isn't big enough to warrant the longer hours worked in the long run.

The one working longer hours might get more work done for a day, maybe a week or two. But after months of work the first person is burned out and the second one is still going strong.