New York Laws
Article 66 - Co-Operative Property/casualty Insurance Companies
6617 - Notice of Assessment; Assessment Corporations.

(b) Such notice may be given personally, by an agent, or by a written
or printed notice mailed, postage prepaid, to such person's last known
post office address, and shall state the purpose of the assessment, the
sum due from such person, and the time when and to whom payment thereof
is to be made; but such time shall not be more than ninety days from the
date of such notice.