; and (2) is of sufficient quantity to ensure that customers in the United States of the respective eligible entity have access to such drugs for at least 6 months (as specified by the Secretary based on the historic demand for those drugs). (b) Selection of drugs (1) In general The Secretary shall— (A) select not more than 50 types of drugs that may be included by eligible entities in a stockpile pursuant to a contract under this section; (B) maintain an up-to-date list of such drugs; and (C) make such list publicly available. (2) Choice of eligible entities A contract awarded to an eligible entity under this section need not require the stockpile of the eligible entity to include all 50 types of drugs listed pursuant to paragraph (1). (c) Sufficient quantity For each generic drug in a stockpile maintained pursuant to subsection (a), the Secretary shall specify the quantity of such drug that is sufficient for purposes of such subsection to ensure that consumers in the United States of the respective eligible entity have access to such drug for at least 6 months. (d) Duration; liquidation of inventory (1) Duration A contract awarded under this section shall be for a term of no more than 3 years. (2) Liquidation of inventory A drug held in a stockpile pursuant to a contract under this section may be liquidated by the eligible entity at the end of the period of the contract. (e) Stockpile requirements (1) Ensuring availability of unexpired products Each eligible entity with a contract under this section for a stockpile of generic drugs at risk of shortage shall— (A) ensure that each drug maintained in the stockpile has an expiration date at least 1 year beyond the current date; and (B) to comply with subparagraph (A)— (i) sell drugs in the stockpile through normal commercial channels and replace those drugs