How many days an IPO remain open for public?

As per Clause 8.8.1, Subscription list for public issues shall be kept open for at least 3 working days and not more than 10 working days. In case of Book built issues, the minimum and maximum period for which bidding will be open is 3 - 7 working days extendable by 3 days in case of a revision in the price band. The public issue made by an infrastructure company, satisfying the requirements in Clause 2.4.1 (iii) of Chapter II may be kept open for a maximum period of 21 working days. As per clause 8.8.2., Rights issues shall be kept open for at least 30 days and not more than 60 days.