HOW LONG WILL MY HAIR BE?

my hair is currently about 3 inches from my shoulders. i wish my hair and regreted cutting it to my shoulders in early november. in preperation for the upcoming school year, how long do YOU think my hair will grow from now to September. Also, i am healthy and i eat healthy (but not over the top) and i excercise about 3-4 times a week for sports. Any ways to make it grow faster?how long will it be in sep.?