I work 4 days a week (2 eight hours, 2 twelve hours) and sometimes is good, sometimes is boring as F.
I used to work a 4 day week
It was the best
Work Monday and Tuesday, off Wednesday, work Thursday and Friday, off Saturday and Sunday: perfect work week imo!
A few companies have already trialled this and it usually increases productivity of the workers significantly. There’s a similar argument to be made for high school kids starting school later in the day and finishing earlier because their teenage brains are not geared to function well in the morning and are generally far more productive in the afternoons. Adult brains are obviously more developed but still generally lack the ability to keep focused for an entire work week. Monday lag and Friday lag decrease productivity, so why not work Tuesday to Friday or Monday to Thursday and get more done?
It would be worse if it meant working more hours per day. I’d rather work five eight-hour days a week than four ten-hour days.