Yes, with a few exceptions it's restricted to a maximum of 8 hours a day on average (and 10 hours max), with 5 days a week.

However, how much stress you can be exposed to in those 8 hours isn't mandated. You can run many businesses understaffed with fairly little impact if you are willing to regularly replace employees suffering from burnout [1]

1: https://en.wikipedia.org/wiki/Occupational_burnout