Okla. Stat. tit. 61 § 111
The awarding of a contract to the lowest responsible bidder or bidders shall be made within thirty (30) days after the opening of bids unless the governing body of the awarding public agency, by formal recorded action and for good cause shown, provides for a reasonable extension of that period, which extension period shall not in any event exceed fifteen (15) days where only state or local funds are involved, or not to exceed ninety (90) days on any award of contract for the construction of a public improvement where funds are utilized which are furnished by an agency of the United States Government. Upon mutual written agreement between the lowest responsible bidder or bidders and the awarding public agency, the Division or awarding public agency may extend the contract award period no more than one hundred twenty (120) days from the bid opening date.
Okla. Stat. tit. 61, § 111