N.J. Stat. § 4:12A-23
Before fixing or refixing any price, the director shall give a notice by public advertisement inserted in at least three daily newspapers of this State that he is considering the fixing or refixing of such price and that a public hearing will be held thereon on the day, time and place set forth in such notice, which day shall not be less than five days after the day of insertion. Within fifteen days after the conclusion of such public hearing the director shall issue findings of fact and an order based upon the evidence adduced at said hearing.
Such order shall specify the date upon which any fixed or refixed price shall become effective and may contain provisions for specific price changes to become effective within three months from the date of such rule or order.
In no case, however, shall any fixed or refixed price become effective sooner than the fifteenth day after such rule or order fixing or refixing the price and the findings of fact upon which it is based have been filed in the office of the Secretary of State.
N.J.S. § 4:12A-23