It's routinely said that what matters isn't the actual length of a movie, but rather how long a movie feels. Killers of the Flower Moon, Martin Scorsese's genre-blending tale of systemic murder set in early-20th-century Oklahoma, runs just slightly under three-and-a-half hours. Unlike Scorsese's 2019 The Irishman, however, which lasted about five minutes longer, his latest epic crime drama feels like three-and-a-half hours.