Okla. Stat. tit. 38, § 38-103
Signatures - Time allowed - Requisite number
Oklahoma Statutes - Title 38. Jurors Page 17
Upon the entering of an order determining the petition to be
sufficient, or upon the successful appeal of an order determining
the petition to be insufficient, the circulators of said petition
shall have forty-five (45) days to obtain a sufficient number of
signatures to impanel a grand jury. Failure to obtain the requisite
number of signatures within that time period shall render the
petition null and void.