; and (B) the person made a good faith effort to locate a product carrier described in subparagraph (A). (2) Duration Any waiver issued under paragraph (1) shall be limited in duration, and shall expire by a specified date that is not less than 30 days after the date on which the waiver is issued. (3) Extension Upon request, if the circumstances under which a waiver was issued under paragraph (1) have not substantially changed, the head of an agency shall, without delay, grant one or more extensions to a waiver issued under paragraph (1), for periods of not less than 15 days each. (4) Deadline for waiver response (A) Response deadline Not later than 60 days after receiving a request for a waiver under paragraph (1), the head of an agency shall approve or deny such request. (B) Findings in support of denied waiver If the head of an agency denies such a request, the head of an agency shall, not later than 14 days after denying the request, submit to the requester a report that includes the findings that served as the basis for denying the request. (C) Request deemed granted If the head of an agency has neither granted nor denied the request before the response deadline described in subparagraph (A), the request shall be deemed granted on the date that is 61 days after the date on which the head of an agency received the request. A waiver that is deemed granted under this subparagraph shall be valid for a period of 30 days. (5) Notice to Congress (A) In General The head of an agency shall notify Congress— (i) of any request for a temporary waiver under this subsection, not later than 48 hours after receiving such request