This isn't just about human rights and treating people fairly, this is about poor efficiency. There are multiple reasons we have the 40-ish hour work week.
"Many people believe that weekends and the 40-hour workweek are some sort of great compromise between capitalism and hedonism, but that’s not historically accurate. They are actually the carefully considered outcome of profit-maximizing research by Henry Ford in the early part of the 20th century. He discovered that you could actually get more output out of people by having them work fewer days and fewer hours."
https://medium.com/building-asana/work-hard-live-well-ead679...
"Many people believe that weekends and the 40-hour workweek are some sort of great compromise between capitalism and hedonism, but that’s not historically accurate. They are actually the carefully considered outcome of profit-maximizing research by Henry Ford in the early part of the 20th century. He discovered that you could actually get more output out of people by having them work fewer days and fewer hours."
http://www.bcmj.org/article/impact-sleep-deprivation-residen...
"In US hospitals, 50000 to 100000 patients die annually from medical errors, and inadequate sleep among physicians may be a factor."
I'm sure there's more data from WWII and later sleep studies as well, yet everyone continues to ignore it.