Okla. Stat. tit. 18, § 18-441-703
Duration of marketing contract
DURATION OF MARKETING CONTRACT. The initial duration of a
marketing contract may not exceed ten (10) years, but the contract
may be self-renewing for additional periods not exceeding five (5)
years each. Unless the contract provides for another manner or time
for termination, either party may terminate the contract by giving
notice in a record at least ninety (90) days before the end of the
current term.