I work 5 days a week and I like my work. But my feeling is that it is too much. My job is demanding enough thst I can't really do a lot on workdays that isn't work related. On saturday I have to do my private shit (cleaning, other chores) which leaves sunday for my real interest stuff. On Monday I am rarely truly rested.

I am pretty sure that is neither in my, nor my employers interest. Since my work quality goes down if I am fatigued. If things continue like this I am going into a burn out and then good luck to them. A 4-day week would be interesting because then I'd have at least a chance to get rest over the weekend.