Okla. Stat. tit. 14A, § 14A-3-511: Regular schedule of payments - Maximum loan term

Supervised loans, not made pursuant to a revolving loan account,

in which the principal is One Thousand Dollars ($1,000.00) or less

and the rate of the loan finance charge calculated according to the

actuarial method exceeds eighteen percent (18%) on the unpaid

balances of the principal, shall be scheduled to be payable in

substantially equal installments at equal periodic intervals except

to the extent that the schedule of payments is adjusted to the

seasonal or irregular income of the debtor; and

(a) over a period of not more than forty-nine (49) months

if the principal is more than Three Hundred Dollars

($300.00); or

(b) over a period of not more than thirty-seven (37)

months if the principal is Three Hundred Dollars

($300.00) or less.