I think the magic meter could fill a bit faster, to fill in ~2 innings (or 1 if you're lucky enough), so 3 innings should be enough to fully experience the mechanics (I'm not good at math, but the player will get around 40 throws and 20 chances to hit the ball).
As the opponent also had the same magic meter, I was expecting them to transform (to crash us completely), not sure if has any effect though.