22 Tex. Admin. Code § 519.2
In computing any period of time prescribed or allowed by these sections, by order of the board, or by any applicable statute, the period shall begin on the day after the act or the event considered, and conclude on the last day of such computed period, unless it be a Saturday, Sunday, or legal state holiday, in which event the period runs until the end of the next day which is not a Saturday, Sunday, or legal state holiday.
Source Note:The provisions of this §519.2 adopted to be effective December 10, 1998, 23 TexReg 12307.