Okla. Stat. tit. 58, § 58-422: Place and time of sale

Sales at public auction must be made in the county where the

land is situated; but when the land is situated in two or more

counties, it may be sold in either. The sale must be made between

the hours of nine o'clock in the morning and the setting of the sun

on the same day, and must be made on the day named in the notice of

sale, unless the same is postponed.