N.H. Rev. Stat. Ann. § 339:29

Such articles when kept for sale shall not be allowed to remain in any street, lane, alley or traveled way, or upon any wharf, or in any yard, or on the grounds of any railroad corporation, in any city for a longer time than 24 hours, or in any town for a longer time than 48 hours, without a special permit from the mayor and aldermen of the city, or from the selectmen of the town, or from some person by them duly authorized. Any person so keeping such articles for a longer time shall be fined not more than $50.