This thing says 27.
I could probably take more once I had killed one and was able to use its limbs as weapons against the others. Would they come at me in swarms, and if so, how large are the swarms? If it's a mad rush of 500 cranky little shits, I'm doomed and wouldn't be able to take many out before I succumbed to their dirty little fingers poking me in the legs and groin. But, if they were to come in small groups of no more than 10, I could go all day and all night. I'd love to try this out some day.