Well, it really depends on the school. I was admitted to several different schools and I received all different types of admittance notifications - one was letter form, a few called me personally, and I believe one was even via e-mail. So it really does depend on just what schools you're waiting to hear from... If you're wondering what type of response to expect from certain schools you applied to, call them! Its not going to hurt your chances in any way...You'll find that most schools are very understanding when it comes to the admissions process and any questions you might have! I was lucky enough to be admitted to most places after a few days following my interview because of high OAT/gpa, but most places generally let you know at least something within 2-3 weeks from what I understand. Good luck!