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However, when a patriotic effect is desired, the flag may be displayed twenty-four hours a day if properly illuminated during the hours of darkness.—Meredith Kile, PEOPLE, 17 Nov. 2025 Data centers must operate twenty-four hours a day to be economically viable.—Stephen Witt, New Yorker, 27 Oct. 2025 Their Countdown To Christmas, filling their networks with festive films twenty-four hours a day is celebrating 15 years this season.—Rebecca Angel Baer, Southern Living, 13 Dec. 2024 Classical music, which was thought to be calming for the wines and the workers, played twenty-four hours a day.—Boris Fishman, The New Yorker, 25 Nov. 2024