The First Appellate Authority (FAA) must reply within 30 days from receipt of First Appeal OR Maximum 45 days, if reasons for delay are given in writing.
Section 19(1) in The Right To Information Act, 2005
(1) Any person who, does not receive a decision within the time specified in sub-section (1) or clause
(a) of sub‑section (3) of section 7, or is aggrieved by a decision of the Central Public Information Officer or the State Public Information Officer, as the case may be, may within thirty days from the expiry of such period or from the receipt of such a decision prefer an appeal to such officer who is senior in rank to the Central Public Information Officer or the State Public Information Officer, as the case may be, in each public authority: Provided that such officer may admit the appeal after the expiry of the period of thirty days if he or she is satisfied that the appellant was prevented by sufficient cause from filing the appeal in time.