I very rarely take sick days. I work 0.5 so I swap days sometimes. When I left my last job, I left months and momths of sick leave. That was a bummer. But the upside was, that when I was preg with DS I took a faor bit of time off coz of morning sickness, and I had a heap of leave so it was no problem.

when my dad retired he left behind something like 600 ish sick days!!!
When my mum got cancer, she had something like 5 months sick leave, so you never know when you will need it