Del. Code tit. 15 § 4947
The election shall be continued open until 8:00 p.m. when it shall be closed. In closing the election the inspector and the judges shall, nevertheless, permit those electors to vote who have presented themselves and have offered to vote prior to 8:00 p.m., provided that at 8:00 p.m. they shall be in a line awaiting their turn to vote within the voting room itself or if the line extends outside of the voting room itself within that line; any person who has not voted or who has not presented himself or herself and offered to vote and is not waiting in line by 8:00 p.m. shall not be permitted to vote after the hour of 8:00 p.m. The inspector shall one-half hour before closing the election make proclamation that the election will be closed in that time.
15 Del. C. § 4947