The Academy of Motion Picture Arts and Sciences,[2] the American Film Institute,[3] and the British Film Institute[4] all define a feature as a film with a running time of 2400 seconds (i.e. 40 minutes) or longer. The Centre National de la Cinématographie in France defines it as a 35 mm film longer than 1,600 metres (5,200 ft), which is exactly 58 minutes and 29 seconds for sound films, and the Screen Actors Guild gives a minimum running time of at least 80 minutes.[5][6] Today, feature films average two hours in length;[7] with children's films typically shorter.