from what I remember, about 2 months. I wasn't aware of the three month deadline they give, which really put me in a bad spot. I got my approval at about 4 weeks out from final exams, corresponding with the time that I can do nothing but focus on outlining and preparing. Then after final exams was Christmas break, and I was out of town for a week. So, I couldn't start studying until 6 weeks before my deadline. I signed up to take it on the very last day allowed, and passed thank god.