It's not a legal right in my part of Europe but it's super common here for couples that both work and have young kids. The kids go to daycare 3 days per week an

It's not a legal right in my part of Europe but it's super common here for couples that both work and have young kids. The kids go to daycare 3 days per week and each parent takes a day off to cover the rest. Having done that now for a while, I would probably keep my 4 days even when the kids get older and aren't at home. The total output in knowledge work doesn't decrease much (if at all) working 4 instead of 5 days. It's much more about what you output then about how much time you spend on it. And working less hours for me meant being more focused in those hours. My targets and bonus remained the same.