Tex. R. App. P. 55.7
As amended through February 20, 2024
Briefs must be filed with the Supreme Court clerk in accordance with the schedule stated in the clerk's notice that the Court has requested briefs on the merits. If no schedule is stated in the notice, petitioner must file a brief on the merits within 30 days after the date of the notice, respondent must file a brief in response within 20 days after receiving petitioner's brief, and petitioner must file any reply brief within 15 days after receiving respondent's brief. On motion complying with Rule 10.5(b) either before or after the brief is due, the Supreme Court may extend the time to file a brief.
Tex. R. App. P. 55.7