Based on past cycles, and as evidenced by threads on this forum, interview calls typically go out a few weeks after the interview deadline.
If you receive an interview call, you'll have plenty of time. They first send you an email notifying you of your pre-selection for interview. A few days later (could take up to a couple of weeks in some cases), they provide you with the names of the interviewers, in sync with whom, you will schedule your interview. Thus, preparation time shouldn't ideally be a concern here.

Good luck!
abhinandm
Hi,
I just submitted my Insead MBA application for class of 2015D today (R2). Normally, how long does it take to know about interview decisions? Does INSEAD wait till the deadline to get back or is it done before that? Also, if they do decide to interview me, how much time will I have to prepare for the actual interview?
Abhinand