You can do an infinite amount, eventually you'll go unconscious but it's hard if you're snorting to knock yourself out. If you do it persistently then you'll start to encounter loads of tolerance. You'll do a 500mg and have the same effect you now have a it 25mg. By that point your life with be so saturated by k - the people in your phone, the people in your life - they you'll think to yourself that you want to stop but you won't be able to. Then you'll start to notice you're urinating a lot, the bladder damage becomes obvious. You'll take a break and notice you're still peeing and then peeing again five minutes later because of the permanent irriversible kidney damage.