I actually have 10 interviews before the 15th (and a few after). I was thinking about canceling some (since I applied early and heard back early I wasn't given the option of scheduling them later), but then realized that if in the case I didn't get in, I'd be regretful ever since. Sure if you view interviews as independent and random processes the odds of getting in after say 9 interviews should be 99.9%, but in reality you get better over time with interviews. Also when I applied last year I know that interviewing kinda got in my way (I didn't get feedback, but I know my interviewing sucked), so I figured that I need more interviews than the average successful applicant.