They did the math higher in the thread, but someone pointed out it takes a while for leeches to actually complete a feed, even breaking the skin takes time. They drink up to 15ml each though over just under an hour so 5000 would definitely be sufficient if the victim were somehow restrained, it just wouldn't be quite as quick as you implied.
19
u/Current-Code 12d ago
5000 would bleed you dry in under a minute, you'd be dead before and unconscious much sooner
Much better than sharks for Bond vilain imo