Tex. Occ. Code § 601.272

The advisory board shall complete a preliminary investigation of a complaint filed with the advisory board not later than the 45th day after the date of receiving the complaint. The advisory board shall first determine whether the person constitutes a continuing threat to the public welfare. On completion of the preliminary investigation, the advisory board shall determine whether to officially proceed on the complaint. If the advisory board fails to complete the preliminary investigation in the time required by this section, the advisory board's official investigation of the complaint is considered to commence on that date.