Im finishing up my MCAt studying for cinco de mayo MCAT and I'd actually answer this the other way around. It doesn't matter how much (as in you can't have too much) content review you have; I'd say lil over 2 months is good for most people. Now, the thing is, what you don't want is too little exam practice. I took the whole semester (Jan 9 - May 5) to review and you need a good couple months of just MCAT practice, as in taking practice FL's, doing section banks and QPacks, so just divide your time to make sure you get ~2 months MCAT experience in addition to however much content review you can handle, 2 months being average/minimum.