> In tech it's very likely someone going from 5 days to 4 days could still achieve the same amount of actual work. As other commenters have said, many tech workers don't do productive work all the time they're present. Retail workers, factory workers, people who fill in the holes in roads, telephone support people, etc aren't contending with pointless meetings and busy work though. They can't do 40 hours of work in 32 hours by removing some of the hours they're not really working. What they do doesn't compress like that.

Indeed, but going to 4 day weeks will require employers to hire more people then to fulfill the same work.

It's absurd that even with all the gains in productivity we're still stuck since decades at the 5x8=40 week. Time to redistribute the producitvity profits towards the workers.