What is the Eligibility Criteria for IGNOU B.ed.?

I have done my post graduation from the University of Delhi with 59.6%. I want to pursue B.Ed. course from IGNOU. One of the eligibility criteria is that the person has to be a trained in-service teacher. I am do not have a NCTE recognised training but I am teaching at a private school. Am I eligible for IGNOU B.ed. Is there a minimum duration of service for an in-service teacher?