(ii) to the extent necessary to permit Indian tribes to participate in such a model. (3) Implementation phase After the design period, the implementation phase of the demonstration project shall be conducted for a period of not less than 48 months and not more than 72 months. (4) Authorization of appropriations (A) In general There are authorized to be appropriated to the Secretary for the purpose of carrying out this subsection, out of any funds in the Treasury not otherwise appropriated, $125,000,000, to remain available until expended. (B) Limitation on use of funds From any amounts appropriated pursuant to this paragraph, the Secretary shall use— (i) not more than $2,000,000 for administrative costs, staffing, and reporting requirements