Oklahoma constitution
Article V: legislative power
Section 26

The Legislature shall also meet in regular session at the seat of government on the First Tuesday after the First Monday in January of each odd numbered year, beginning at twelve o'clock noon for the purposes only of performing the duties as required by Section 5 of Article VI of the Constitution and organizing pursuant to the provisions of this Article and shall recess not later than five o'clock p.m. of that same day until the following first Monday in February of the same year, beginning at twelve o'clock noon.