Up to two years in my country. Friend of mine has been off for 4 months due to burn out.

In my country, yes

My university teacher was on paid leave for 2 years due burnout. She was my masters thesis instructor, so we talked a bit about it after she came back and it sounded pretty scary. She'd picked up her kid from kindergarten, drove a bit, and then she had to call her husband because she had completely forgotten where she lived. She was instructed to avoid all stress until symptoms went away, and that's how long it took.