Any rule or regulation promulgated, modified or revoked under this article may contain a provision delaying its effective date for such period (not in excess of ninety days) as the Director determines may be necessary to insure that affected employers and employees will be informed of the existence, modification or revocation of the rule or regulation and of its terms and that employers affected are given an opportunity to familiarize themselves and their employees with the existence of the requirements of the rule or regulation.