I've read a lot about how great working a 4 day week is as opposed to 5. Proponents say it leaves lots of time for personal projects and enables you to be more focussed for those days you are at work. However, I've not heard much about the downsides of working less days. For those of you who have done it, have you found there are any disadvantages of taking an extra day a week off, and have you/would you go back to working 5 days again?
