SEBI is working towards reducing the number of days taken for listing of a company’s shares from the date of closure of its public offering — to four working days (called T+ 4) from six now.
The T+6 timeline was implemented effective January 1, 2016. Prior to this, the time taken was T +12 (effective May 3, 2010) and before that T+22.Speaking at the International Conference on Certification & Capacity Building in Financial Markets at the NISM Campus at Patalganga in Navi Mumbai, UK Sinha, Chairman, SEBI, said: “The SEBI team is already working to bring the timeline down to T+4 days.”Sinha said the National Institute of Securities Markets (NISM) would focus on research using the data resting in the SEBI system and the stock exchanges.

Source - http://www.thehindubusinessline.com