Here's a small story for this:
I asked Terra, that how long she can stand tickling?
She answeard: "Whooo.... pretty question... I think I'm tough soo about 4 hours.
(I was the happiest when she answeard that XD )
Soo let me just say that. She wasn't tough enough.
I tried to ilustrate how can a girl look like after 2 and half an hour of tickling session.
I hope you like it