It depends on how late in the cycle you submitted your secondaries. The earlier they were submitted (as in mid-September for me), I heard back in about 2-3 weeks from most schools.
Try a search since this has been frequently asked.
Good luck.
Oh, and it might help if you called the schools to verify if your entire file is complete. Even if your secondary was received, if the file is incomplete and missing lor's, then you will not hear about an interview.