The whole idea that our lives should be divided into seven days chunks always seemed strange to me. If I'm "in a flow", 5 days is too little for me – I almost force myself to switch to "weekend mode". And two days of weekend is too short – I can't travel to anywhere, I can't switch so something else that requires another "flow". Basically, 5-2 cycle gives you sense of having some personal time without giving you any personal time.

Probably 10-4 or 10-5 would be more healthy and liberating in some sense.