Tex. Est. Code § 351.253

Except as otherwise provided by this section, the term of a loan or lien renewal authorized under Section 351.252 may not exceed a period of three years from the date original letters testamentary or of administration are granted to the personal representative of the affected estate. The court may authorize an extension of a lien renewed under Section 351.252 for not more than one additional year without further citation or notice.