When I've got holiday to use up, I book Wednesdays off. It means I've never got more than two work days in a row, and I also get the benefit of the general slow-down on Friday afternoons to actually get stuff done uninterrupted.

Me too! This is why it works imo

p.s. that phenomena is called "Parkinson's Law" i.e. work expands to fill the time allotted to it