"Yeah, Thursdays. And if those fill up I'll shoot you a text and move shit around."

Because his life is pretty chaotic, so he can't count on a day staying open indefinitely.

"And yeah, you learn fast, but it takes more than a day to learn how to fight."

He can't deny that Fizz was way better at learning...well, pretty much everything in the circus than he was. That's why his dad liked Fizz better, and that's why Blitzo was such a disappointment. Still, fighting's a skill, and it takes time to learn.