Sorry I could write it more clear I suppose; I meant 4 hour daily work 6 days almost has the same productivity (if not more) as 8 hour daily work for 4 days. I

Sorry I could write it more clear I suppose; I meant 4 hour daily work 6 days almost has the same productivity (if not more) as 8 hour daily work for 4 days. If you consider time for lunch and productivity decline in long working hours; having usable free time everyday without spending all your mental energy has huge benefits.