I have some friends who work at a medium-sized and very profitable company in SF that gives them every other Friday off. They have to organize it such that the

I have some friends who work at a medium-sized and very profitable company in SF that gives them every other Friday off. They have to organize it such that the office doesn't shut down completely on Fridays but that's not so hard, swapping weeks with someone is usually possible. An interesting effect of this is retention: once people are used to working two fewer days a month, they are very reluctant to lose that "perq." As a random point of comparison, in Germany an employee has a legal right to work part-time unless the employer can prove your job can only be done full-time. "We'd have to hire more people" is not proof. Your benefits would not change but you'd earn N% less money, based on how much less you work. IIRC the maximum is half-time. I have no idea how often it's used but in principle it's an awesome idea if you want to change your life up, have kids, get a PhD, whatever. (I don't remember whether you have a right to go back to full-time, but I think you do not.)