34 Tex. Admin. Code § 43.7
In computing any period of time prescribed or allowed by this section, by order of the board, or by any applicable statute, the period shall begin on the day after the act, event, or default in question and it shall conclude on the last day of that designated period, unless it is a Saturday, Sunday, or legal holiday, in which event the period runs until the end of the next day which is neither a Saturday, Sunday, nor a legal holiday.
Source Note:The provisions of this §43.7 adopted to be effective April 20, 1988, 13 TexReg 1672.