For how many days an issue is required to be kept open?

Opening periods are different for different kind of issues. The period for which an issue is required to be kept open is:

1. For Fixed price public issues: 3 to 10 working days
2. For Book built public issues: 3 to 7 working days extendable by 3 days in case of a revision in the price band
3. For Rights issues: 15 to 30 days.