N.Y. Comp. Codes R. & Regs. tit. 9 § 8800.6
After the office has received a petition for an advisory opinion, any party that submits any additional information to the office shall, at the same time, send copies of such information to all other parties and shall state in its submission to the office that it has done so. Any person other than a party may also submit additional information to the office. Any person other than a party who submits information to the office should, at the time of submission to the office, also send copies of such information to all parties to the petition and state in its submission to the office that it has done so. Additional information may be submitted to the office within 30 days of the date of the office's receipt of the complete petition. All parties shall have 10 days from the office's receipt of the additional information to submit a response to the additional information to the office.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 8800.6