[There's plenty for both of them! After all, he's the one who was looking for someone to share with— it would be awfully rude if Ann weren't willing to share in turn.

She looks at him for a moment, bewildered as she tries to process that question, swallowing her dough before answering.]

What's a month? It's— well, they vary in length, but they're usually thirty days long. Sometimes thirty-one. There's one that's twenty-eight, and then every four years it's twenty-nine— uh, don't worry about that. Thirty days! It's thirty days.

[Nailed it.]