To pay my way through college I spend a summer once working in a factory. My work hours were: 8 am-4 pm for seven days, one day off; 4 pm-midnight for seven days, two days off; midnight to 8 am for seven days, four days off. Then the rotation began again. Many people at that factory worked that schedule for decades. I don’t know if my state had Wisconsin’s law but it seems it would limit my flexibility if I had wanted to work more days to get more overtime or to get a special lump of time off.
Similarly, a couple of years later I saved up for graduate school by working a normal 40-hour week and then staying on duty another four hours at least three days a week, adding up to 50-60 hours a week. I was young, single and ambitious.
I don’t recommend that as a lifestyle but it really helped me financially when I could do it.
My husband had a similar situation where his employer would let him set his hours around his classes. He worked and paid his way up to and through graduate school.