While the study was 4x8, let me just add how awesome 4x10 is with work from home.

Roll out of bed at 6:30, take a shower, put on a t-shirt and jeans, at work by 7. Maybe put on a button down if I have a client call. Start dinner at 4:00. Get it in oven, go work some. Dinner done at 5. Answer emails while hanging out with family/friends.

Goddamn I'd rather do 10 hours of work that way than 8 hours of work where I dressed up and spent 45 minutes commuting each way.