Pub. L. 105-391, tit. IV, sec. 404
TERM OF CONCESSIONS CONTRACTS.
SEC. 404. TERM OF CONCESSIONS CONTRACTS. A concessions contract entered into pursuant to this title shall generally be awarded for a term of 10 years or less. However, the Secretary may award a contract for a term of up to 20 years if the Secretary determines that the contract terms and conditions, including the required construction of capital improvements, warrant a longer term.