No contract for health spa services shall require payments or financing by the buyer over a period in excess of twenty-five (25) months from the date the contract is entered into, nor shall the term of any contract be measured by or be for the life of the buyer; however, the availability of the health spa facilities to the buyer and under the contract may extend over a period not to exceed two (2) years from the date the contract is entered into, with the right to renew for additional periods of equal length.