I do not think there should be a legally mandated ceiling on weekly work hours because many people need to work extra hours to support their families and without the extra hours some might start to illegally work under the table which will cause much conflict and disruption. This will also result in many people losing their homes and going deep into debt. Some people really need the extra hours for a job like being a surgeon. If you were to be a surgeon and you were only aloud to work 40 hours a week there would be many people in distress because they have to wait so long for a properly qualified surgeon to operate.
I agree that there should be a legally mandated ceiling on weekly working hours. Having a cap on weekly working hours could potentially reduce stress, create more family time, add more jobs, eliminate a few abusive cases and less chances of error. If a single person is working 80 hours a week, it could be keeping another person from a job. Instead of that single person working 80 hours, it could be two working 40 hours each. A cap on work hours could reduce error by giving people more hours of sleep. The more hours your working, the less sleep you get and the greater chance of error. It could potentially eliminate a few abusive cases because when people are stressed by the lack of sleep they can get frustrated and angry, which could cause them to lash out. Although I do think there should be a ceiling on most jobs, it shouldn't apply to community jobs like doctors, truck drivers and police officers. I think that there should be a legally mandated ceiling on weekly working hours because it would improve us as a society by creating overall healthier people.
Although you may have less stress and more family time, there will be a new problem at hand. Peple will start illegally working to get the income they require. The goverment will be furious and they can't put a law in place to stop them because there is already a law that says working under the table is illegal.
Point recognized, but, if you don't have stress from all the work, you will be less pressured to work under the table. As you said, the government won't be furious because they can just place larger fines on working under the table. Think about it, would you rather stay safe and with less stress and more sleep or work under the table for a bit more money and risk having to pay more than you've earned and going into deep debt.
Less stress will not solve the problem at hand. People may be more stressed because they are working illegally and just Because you are less stressed has nothing to do with working under the table. If you are working under the table it is because you need the money.