I got sped through pretty quickly. My application arrived on the day their admissions committee meets, so I got an invitation to interview that Friday. The very next Wednesday (yesterday) they notified me that I was accepted. So I guess all things considered, it took five days from interview to acceptance.
In terms of profile, I go to a well regarded liberal arts college, 3.74 GPA, 4.0 SGPA, three summers interning at a lab, and ten months volunteering at an ER. Also got 1330 in the GRE and a 6 on the writing portion.