So The Big One says she's invited to a sleepover at Emily's* house and they're going swimming the next day and can she go?
I say sure.
We get to Emily's house and I ask Emily's dad "When do I pick her up?"
He says, "Six o'clock. Tomorrow."
"You mean 24 hours from now? For real?"
Turns out, the swimming was not at the local pool, like I assumed, but at someone's house that's about a 20 minute drive away.
Apparently, I have to learn to ask a few more questions in dealing with a high schooler.
*Collective noun for all The Big One's friends.