Fla. Stat. § 905.095

Upon petition of the state attorney or the foreperson of the grand jury acting on behalf of a majority of the grand jurors, the circuit court may extend the term of a grand jury impaneled under this chapter beyond the term in which it was originally impaneled. A grand jury whose term has been extended as provided under this section shall have the same composition and the same powers and duties it had during its original term. If the term of the grand jury is extended under this section, it shall be extended for a time certain, not to exceed a total of 90 days, and only for the purpose of concluding one or more specified investigative matters initiated during its original term.