N.J. Stat. § 19:15-2
The district boards shall open the polls for such election at 6:00 A.M. and close them at 8:00 P.M., and shall keep them open during the whole day of election between these hours; except that for a school election held at a time other than at the time of the general election the polls shall be open between the hours of 4:00 P.M. and 8:00 P.M. and during any additional time which the school board may designate between the hours of 6:00 A.M. and 8:00 P.M.
The board may allow one member thereof at a time to be absent from the polling place and room for a period not exceeding one hour between the hours of 1:00 P.M. and 5:00 P.M. or for such shorter time as it shall see fit.
At no time from the opening of the polls to the completion of the canvass shall there be less than a majority of the board present in the polling room or place, except that during a school election held at a time other than at the time of the general election there shall always be at least one member of each district election board present or if more than two district board members are designated to serve at the polling place, at least two members present.
N.J.S. § 19:15-2