Not sure didn't count and box cover doesn't say. 40-50 seems the common number so probably around that. There are two more shot glasses in the scene prior to that final five. Why does the director film great movies like this then release crap like other gokkuns? For one thing no shots of guys wanking off, a couple of gokkuns have the guys just behind the girl to the side so you can see them whacking off

Although Knox has tats would like her to come back this time for 100 gokkun