Her in Norway most people work 37.5 hours (40 hours present with an unpaid half hour lunch break). And if you are salaried then you can pretty much come and go as you please. I read somewhere (VG perhaps) that about 100k people work a four day week (same total time) here (out of a total 5.5 million population). It's especially attractive for people who have a long or stressful commute.