Difficult to say. Big gloryholes are quite rare now. Not that long ago it was really "draughty" in World Trade Center, for example. Almost every toilet unit had GIGANTIC gloryholes. Big enough to hand a BKK POST without folding!
However, probably due to customer complaints they cracked down on it. For quite a while not even the tiniest hole. Now I spot some cruising going on in WTC, but not quite as much as before.