Ya, 12 or 13 quarts. 8 is far from "most", for me anyways.
We use litres. 1 quart = .94 litres, so basically the same. I've never put more than 7 litres, usually 6.25-6.5 litres.
Google led me to a page where a guy did a pan drop and had to put 10+ quarts in.