How long should I expect it to take for my 13 yo dd to start showing improvements when switching pitching styles? She just started with a new pc and is going from the open and close to now staying open. I made the decision to try to gain some velocity (which I thought was not happening with the other pc) and hopefully a little more movement on her breaking pitches. Her breaking pitches were moving but just not consistent. I hope I've made the right choice and that she'll be ready for summer ball.