Section 46 in The Securities and Exchange Board of India (Issue of Capital and Disclosure Requirements) Regulations, 2018
46. Period of subscription.
(1)Except as otherwise provided in these regulations, an initial public offer shall be kept open for at least three working days and not more than ten working days.(2)In case of a revision in the price band, the issuer shall extend the bidding (issue) period disclosed in the red herring prospectus, for a minimum period of three working days, subject to the provisions of sub-regulation (1).(3)In case of force majeure, banking strike or similar circumstances, the issuer may, for reasons to be recorded in writing, extend the bidding (issue) period disclosed in the red herring prospectus (in case of a book built issue) or the issue period disclosed in the prospectus (in case of a fixed price issue), for a minimum period of three working days, subject to the provisions of sub-regulation (1).
