Tex. Transp. Code § 601.159
The department shall suspend the driver's license and each vehicle registration of an owner or operator or the nonresident's operating privilege of an owner or operator unless:
(1) if a hearing is not requested, the person, not later than the 20th day after the date the notice under Section 601.155 was personally served or sent:
(2) the person complies with Section 601.153 not later than the 20th day after:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Acts 2017, 85th Leg., R.S., Ch. 1079 (H.B. 3376), Sec. 8, eff. September 1, 2017.