Hahah, damn, I spend too much time on here and I read every time someone mentions me
Infinitely many is the answer
JK, but some girls can have a lot, really a lot, consecutively or with a pause.
I've only had a multi once myself, it's like wow, it's like when you reach the point of no return in a normal orgasm, but it just keeps on going higher and higher and you're coming, but each time harder, hard to describe. Some girls can go on and on like that regularly.
My personal record is 4 in one session (with pauses), really sad when I see some other girls having multis, but I ain't complainin'
You can't always tell, as they build up they're much harder to hide. But it depends on the intensity. Not all of them are the same and some of them can happen completely silently (good for public places anyways

)
Intrigued, that sounds like a lot of fun!