> It's a more grown-up arrangement where businesses realise that regular time off (and as much time as you need if ill) increases happiness and therefore productivity.

Is there a metric of some sort that I can share with other people that demonstrates 4 weeks PTO does work and has led to increased productivity in Australia?

I personally believe in shorter work weeks, but my experience is anecdotal, so was wondering if there was a study or some kind of economic metric that reflects that statement for increased productivity in AU.