There are 123 lean-tos shown. My last count of lean-tos in New York State was around 275 total- so what's shown is roughly 44% of the total number of lean-tos in NY.
Of the 123 shown, 3 (Black Pond, Long Pond, and Bozen Kill) are day use only. Of the remaining 120 where one can legally camp, I've spent at least one night in 79. (My currrent total is somewhere around 115 or 120, but I don't have pictures of the others, unfortunately!)