(725 ILCS 5/108-6) (from Ch. 38, par. 108-6)
    Sec. 108-6. Execution of search warrants.
    The warrant shall be executed within 96 hours from the time of issuance. If the warrant is executed the duplicate copy shall be left with any person from whom any instruments, articles or things are seized or if no person is available the copy shall be left at the place from which the instruments, articles or things were seized. Any warrant not executed within such time shall be void and shall be returned to the court of the judge issuing the same as "not executed".
(Source: Laws 1963, p. 2836.)