I did 2 months of 4 day week, got loads of work done on the house at home, daog walkes, down time, workshop time etc, it really is the nuts compared to a 5 day week. If I could negotiate an extra 1/2hr a day and a small pay cut for a 4 day week I'd be in like FLynn
Several colleagues approaching or past first retirement do 3 and 4 day weeks. It is the way forward.
It seems to fit the bill financially as well, a lot of people can't afford to fully retire, but are at an age where they probably don't need the stress and strain of a 5 day week
And WFH helps even more, as the half hour trip each way has gone - so, I'm currently working 4.5 days in 4, which is brilliant. No more time, but half-a-day's extra pay.