[rococode]

I think it probably works. The 6th day in particular seems like it would be a big boost. Technically, even if having a work week 80% longer than your competitors only ekes out a 10% boost to the amount of work done, that's still a big advantage.

[regularfry]

The problem then is that the weekend is 50% shorter, so workers are coming to work on Monday without having rested as effectively. In the long run, I can well imagine that costing 10% or more.