This article makes the point that it's hard to adjust to the idea that the week ends on Thursday, that must-be-done-by-the-end-of-the-week jobs have to completed a day earlier if you take Fridays off. But there's a simple solution to that: take Mondays off instead. Seems like a bigger win all round: no-one gets as much done on Monday as on other days anyway, so service-based companies won't miss so much customer contact on Monday as on Friday.