Tex. Occ. Code § 504.304
(a) Not later than the 20th day after the date the person receives the notice under Section 504.303, the person may:
Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.
Acts 2007, 80th Leg., R.S., Ch. 1373 (S.B. 155), Sec. 18, eff. September 1, 2007.
Acts 2015, 84th Leg., R.S., Ch. 1 (S.B. 219), Sec. 5.115, eff. April 2, 2015.