My episode average is about 20 too, it seems.
Anime and manga does possess an addictive element, which once you've acquired, you will end up regularly watching or reading on a frequent basis. Eventually, over the proceeding years, you'll amass quite the record. On one hand, I find it hard to believe that I've watched so much. I'll admit to carefully going through my list, one by one, ensuring that I have 100% definitely seen each anime, only to find that have indeed 100% definitely seen them. I often think to myself that it "can't be that much, surely?", but sadly it is. On the other hand, when you've watched anime for as long as I have, spanning more than half my life, it's inevitable that you'll accumulate over time.