There are reasons why two days is not long enough for the weekend, and these are they.
There's two. The first is that Saturday is next to Friday, and the second is that Sunday is next to Monday. The whole weekend is contaminated by contact with the not-weekend.
Anybody remember Dinosaurs? Not the momma! Ahem. Where was I?
Ah yes, a three day weekend, that would be perfect. All that's needed is one day in the middle and two days to act as a buffer zone on either side. One pure, pure day of nothing except relaxation and wine.
Now, I'm not necessarily asking for a four day working week here. I've no problem with working five days in a row. What I'm suggesting is that we get this extra day off by making the week eight days long, which is surely the perfect solution.
What's that you're saying about science and moon cycles and the solar system and stuff? I don't understand. Or maybe I just can't hear you.