it really depends on the school and what time during the cycle it is. i had some schools get back to me within 2 weeks, and others that took 3.5 months. sometimes if a school's interested they may get back to you sooner, or put your application on hold for a few months and make a decision later as to whether or not they want to grant you an interview. a well-staffed school makes a huge difference too...you'll be surprised as to how slow the admissions office at some schools are! also if you get your secondary in at the peak of the cycle, get ready to be really patient.