I fly from PIT, and it has to be one of the worst for this. I do not check bags unless I absolutely, positively must - and when I do I will literally feel myself age as I wait for the bags at PIT.
I've wondered if they don't use a modern cart system there. Given that one bag at a time often comes down with long minutes in between, maybe they actually use Pepe, the mule, to ferry the luggage at PIT instead.
Longest wait? 15 years has me beat, for sure. But I've done plenty of stints in 3-day-no-bag pergatory.