It is traditional to discuss the length of theatrical motion pictures in terms of "reels." The standard length of a 35 mm motion picture reel is 1,000 feet (300 m). This length runs approximately 11 minutes at sound speed (24 frames per second) and slightly longer at silent movie speed (which may vary from approximately 16 to 18 frames per second). Most films have visible cues which mark the end of the reel. This allows projectionists running reel-to-reel to change-over to the next reel on the other projector.
A so-called "two-reeler" would have run about 20–24 minutes since the actual short film shipped to a movie theater for exhibition may have had slightly less (but rarely more) than 1000ft (about 305m) on it. Most projectionists today use the term "reel" when referring to a 2,000-foot (610 m) "two-reeler," as modern films are rarely shipped by single 1,000-foot (300 m) reels. A standard Hollywood movie averages about five 2,000-foot (610 m) reels in length.
The "reel" was established as a standard measurement because of considerations in printing motion picture film at a film laboratory, for shipping (especially the film case sizes) and for the size of the physical film magazine attached to the motion picture projector. Had it not been standardized (at 1,000 feet (300 m) of 35 mm film) there would have been many difficulties in the manufacture of the related equipment.
(c) Susann Disbro Gilbert
Reference:
http://en.wikipedia.org/wiki/Reel
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