Greetings!
When does a book calculate the reward: when it starts or when it ends? It would make sense to do it when it ends, but I don't want to miss out on any part of my 10M battle stat reward if I'm wrong.
I checked the wiki and some of the guides on books and while I found one suggestion to "time it so you hit 200M right when the book ends", there's nothing definitive. Is there a definitive answer that I'm missing?