(a) A warrant issued under this subchapter is valid for a period not to exceed 60 days after the date the warrant is issued, unless the prosecutor or prosecutor’s assistant applies for and obtains an extension of that period from the court before the warrant expires.
(b) Each extension granted under Subsection (a) may not exceed a period of 60 days.

(c) A district court that issues a warrant under this subchapter shall order the warrant and the application for the warrant sealed and may not unseal the warrant and application until after the warrant expires.