W. Va. Const. art. VI, § 22

Length of legislative session. The regular session of the Legislature held in the year one thousand nine hundred seventy-three and every fourth year thereafter shall, in addition to the meeting days preceding the adjournment provided for in section eighteen of this article, not exceed sixty calendar days computed from and including the second Wednesday of February, and the regular session held in all other years shall not exceed sixty calendar days computed from and including the second Wednesday of January. Any regular session may be extended by a concurrent resolution adopted by a two-thirds vote of the members elected to each house determined by yeas and nays and entered on the journals.