"They don't know going in," Nico said. "And most of the time, people don't want to leave because the mind is numbed. But strong minds can notice the change; of course, gods could take anyone out of there at their leisure. Or put them in."

Oh, crap. He forgot something. "I forgot to mention they were on a deadline before a war between the gods broke out. So, yeah, Percy and his friends spent an hour inside the casino, while outside, three days went by."