Okla. Stat. tit. 19 § 1415
Within fifteen (15) days after the filing of any county budget with the State Auditor and Inspector, any taxpayer may file protests against any alleged illegality of the budget in the manner provided by Sections 24104 through 24111 of Title 68 of the Oklahoma Statutes. If no protest is filed by any taxpayer within the fifteen-day period, the budget and any appropriation thereof shall be deemed legal and final until amended by the county budget board. Taxpayers shall have the right at all reasonable times to examine the budget on file with the county clerk, county excise board or the State Auditor and Inspector for the purpose of checking for illegalities in the levies made or for filing protests in accordance with this section.
Okla. Stat. tit. 19, § 1415