I get that the state needs to protect people from being exploited but I'm not sure this is the right way to go about it.
It seems to me that it would be better if the state had policies in place to ensure that one full-time job (or less even) provided sufficient income to enable a person to live self-sufficiently and raise a family.
Working a full-time job and raising a family is often a more stressful thing than a single person working a job that requires over-time. I don't see why the state should regulate how someone without kids spends their free time if that person wants to work.
Some people are just naturally inclined to be active, whether it's some combination of work, family, volunteering, and sports activities while others are not. I have a friend who is constantly working and constantly going to concerts and playing on several sports teams. His life seems stressful to me and far beyond how I want to spend my life but he enjoys it.
The state shouldn't restrict people from choosing how to spend their time, but instead should strive to create a society where people aren't forced to spend too much of their time working to meet their basic needs, with the ultimate goal of gradually reducing the time needed to do so over time.