Section 23L(2) in The Securities Contracts (Regulation) Act, 1956
(2)Every appeal under sub-section (1) shall be filed within a period of forty-five days from the date on which a copy of the order or decision is received by the appellant and it shall be in such form and be accompanied by such fee as may be prescribed:Provided that the Securities Appellate Tribunal may entertain an appeal after the expiry of the said period of forty-five days if it is satisfied that there was sufficient cause for not filing it within that period.