There's an economist at the University of Oxford in England named Jan-Emmanuel De Neve, and he says that studies show that we'd all be better workers if we always had three-day weekends.
Quote, "I would argue the four-day work week is spot on in striking that right balance between improving the work-life balance and unlocking . . . productivity gains. This outweighs the net reduction in productivity from working a day less."
In other words, you'll get more done in four days than you do in five . . . if you can start spending that fifth day doing anything BUT working.