This is from Good Luck Charlie. In the park, PJ caught sight of an entertainer. He rushed to him, saying:
PJ: You're the guy who can help us. I was talking to a girl here earlier. We need to find her. She said you worked a birthday party for her brother.
The entertainer: "So? I've worked lots of parties."
PJ: "Where was the party where you fell on the cake?"
The entertainer: "You got three hours?" (Laughter from the audience)
What does the last sentence "You got three hours?" mean?