25 CFR 140.11: License period.

Licenses to trade shall not be issued unless the proposed licensee has a right to the use of the land on which the business is to be conducted. The license period shall correspond to the period of the lease or permit held by the licensee on restricted Indian land, except that where the proposed licensee is the owner or beneficial owner or holds a use right to the land on which the business is to be conducted, the license period shall be fixed by the Commissioner of Indian Affairs or his authorized representative, but in no case shall the license period exceed 25 years.