The 9-5 became mainstream about a century ago and, somehow after the vast technological progress we’ve made, we’re still stuck with so many hours of work. Hell, it’s actually more like 8-5 if you have a solid lunch hour (unpaid, of course, even though you have to be at or near work to get back to it on time). Given how much productivity has increased, we’re owed 3-day work weeks. 3-day work weeks also make it easier to raise children if you can align it so that the parents’ workdays don’t overlap.