Listing application timelines require prompt filing; delayed applications attract penal interest and non listing mandates refunds with interest. Issuers must complete pre listing formalities and apply for listing to recognized stock exchanges promptly after allotment with required documents; delays in filing attract penal interest payable to allottees for each day of delay from the end of the post allotment grace period until listing, and failure to obtain listing permission or withdrawal of an observation letter renders securities ineligible for listing and obliges the issuer to refund subscription monies with interest from the date of allotment.