I've watched a lot over my 20+ years of adult life. According to my list (and this is everything like OVAs, web specials, movies, ongoing, etc) I have well over 1400+ in my catalog of watched. Of course watching like 13+ new anime when a season hits keeps that growing, haha.
I'd have to go and try to break it down to see what my list would look like if I just looked at specific formats or only 24+ ep series and such.