Not at all. People will freely choose how many hours they would want to work. Of course, if someone decides to get a second job, this person would be taking the job away from another person that could be working those hours, but there shouldn’t be any penalty. When this individual sees other people working shorter work-days of 4 hours and getting decent incomes, it will create a necessary incentive for this people to periodically reduce their hours as well. The spouse, for example, after seeing that their neighbor or relatives have a great work/life balance with a shorter work-day, they will demand their husband to try to do the same. Or perhaps the kids will be the ones who would demand the parent to not spend so much time working. Little by little, this pressure will migrate people to shorter work hours.