Isn't there a 6 days week in some jobs standard even if for "office jobs" and the like it's only a 5 days week? In EU?
In Poland, there is a 5-day work system.
In some industries, weekend work is allowed, for example in medical services.
In a "typical" job, a person who works, for example, on Saturday, must be given a day off on another day of the week.
Additionally, if an employee works more than 8 hours on Saturday, he or she should receive a bonus for each overtime on that day.
I may be wrong here, but I think it's true.
Of course, these are just a few details.
There are many more details, but I don't know much about it.
It depends on the job, company, etc.
Practice also sometimes verifies the law.