South Dakota Statutes § 12-2-3 Opening and closing times for polls-Voters in line at closing time

At each election to be held under this title, the polls shall be opened at the hour of seven a.m. and remain continuously open until seven p.m., standard time or daylight savings time, whichever is in effect. However, no polling place may be closed at any election until all the voters who have presented themselves at the polling place inside or outside for the purpose of voting prior to the time of the closing of the polls have had time to cast their ballots.