If the election is not held by mail ballot, the polls must be open at one p.m. of the election day and must be kept open until five p.m. of the same day.
N.D. Cent. Code § 61-06-15
Opening and closing hours of polls at irrigation district elections
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.