Under the Insolvency and Bankruptcy Code, within how many days must an operational creditor deliver a notice or invoice demanding payment to the corporate debtor?

Section 9-Application for initiation of corporate insolvency resolution process by operational creditor: (1) After the expiry of the period of ten days from the date of delivery of the notice or invoice demanding payment under sub-section (1) of section 8, if the operational creditor does not receive payment from the corporate debtor or notice of the dispute under sub-section (2) of section 8, the operational creditor may file an application before the Adjudicating Authority for initiating a corporate insolvency resolution process.