Subscription period for IPOs must fall within prescribed limits; extensions required on price revisions and unforeseen events. Regulation 46 requires an initial public offer to remain open not less than three working days and not more than ten working days. A revision in the price band mandates extension of the disclosed bidding period for a minimum of three working days. In cases of force majeure, banking strike or similar unforeseen circumstances, the issuer may, with reasons in writing, extend the bidding or issue period for a minimum of one working day, subject to the regulation's minimum and maximum limits.