Tex. Civ. Prac. & Rem. Code § 15.0642
A party may apply for a writ of mandamus with an appellate court to enforce the mandatory venue provisions of this chapter. An application for the writ of mandamus must be filed before the later of:
Added by Acts 1995, 74th Leg., ch. 138, Sec. 5, eff. Aug. 28, 1995.