For those interested in gaining insight on working hours throughout history, I would recommend you to take a look at OurWorldInData's empirical study. It looks at weekly work hours since 1870s, hunter-gatherer work hours, productivity vs annual work hours, etc.
https://ourworldindata.org/working-hours
It begs the question, is a portion of society burning out because of the type of work, current lifestyle, our knowledge & expectation about the world, something else or a combination of factors?