A feature film is a film that runs for 40 minutes or longer, according to the Academy of Motion Picture Arts and Sciences, American Film Institute, and British Film Institute, though the Screen Actors Guild states that it is 80 minutes or longer.

The majority of feature films are between 90 and 210 minutes long. The Story of the Kelly Gang was the first feature film based on length, and was released in 1906. The first feature-length adaptation was Les Misérables which was released in 1909.

Feature films for children are usually between 60 and 120 minutes. Other early feature films include a version of Oliver Twist (1912), Richard III (1912) and From the Manger to the Cross (1912).

Many feature films tend to be adaptations of literary works. Notable feature length adaptations include The Godfather, Gone With the Wind, Dracula, Forrest Gump and The Lord of the Rings trilogy.

The Academy of Motion Picture Arts and Sciences, the American Film Institute, and the British Film Institute all define a feature as a film with a running time of 40 minutes or longer. The Centre National de la Cinématographie in France defines it as a 35 mm film longer than 1,600 metres, 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. Today, a feature film is usually between 80 and 210 minutes^{[citation needed]}; a children's film is usually between 60 and 120 minutes^{[citation needed]}. An anthology film is a fixed sequence of short subjects with a common theme, combined into a feature film.

Brian Jun (born October 21, 1979) is an American film director, screenwriter, film editor and producer. Jun has made two short films, Jimmy Brown and Researching Raymond Burke. Jun won the Sundance Channel Emerging Director Award in 2006 at the St. Louis Film Festival for his first feature film Steel City. The film also received a nomination for the grand prize jury award at the Sundance Film Festival in 2006. As of June 2008, his second feature film The Thacker Case is in post-production.

Since he was a child, Jun always had an interest in film and literature and, inspired by the work of Sam Shepard, Neil Simon and Samuel Beckett, he began to create his own characters and to write screenplays. Jun attended Webster University in St. Louis, where he learned the basics of filmmaking. Jun's first work was the short film Jimmy Brown, an hospital drama dealing with racial issues. The film was based around conversations between two characters, played by Dennis Lebby and Jun himself. A screening of the film at Los Angeles Shorts Film Festival led to the opportunity to make another short for Fox Searchlab; a program run by Fox Searchlight Pictures with the aim of nurturing up-and-coming talent. The result of this was Researching Raymond Burke, a short featuring John Heard. Jun's original plan was for this to be a tester to a feature film entitled In the World of Raymond Burke but he did not manage to acquire the capital to produce the film and the project was abandoned.