A unit of running time used in the motion picture industry to describe the length of films, about 10 minutes. Early projectors used reels that held 1000 feet of 35mm film, which at 24 frames per second has a running time of 11.1 minutes. Later 2000-foot reels became common, and finally systems in which the film was fed from horizontal platters and reels were not used during projection, though they continued to be used to transport the print.

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