Definition:

Film Duration: In cinema and television terminology, it refers to films typically lasting 60-90 minutes or longer. According to international standards, a film is considered feature-length if its runtime is generally 70 minutes or more.
Type: Designed to tell a story in greater detail, feature-length films are intended for theatrical release.

Etymology:

Derived from the French term "métrage" (measurement, length), used in cinema to denote the length of a film reel. The concept evolved as films transitioned from short reels to longer formats suitable for detailed storytelling.
Historical Usage: In the early days of cinema, films were predominantly short. Feature-length films gained popularity with advancements in technology and storytelling techniques. One of the first feature-length films is the Australian production The Story of the Kelly Gang (1906), with a runtime of 70 minutes.

Cinema: The term "feature-length" is a standard category in film production.
Television: Refers to films produced for theatrical release but also broadcasted on television.
Academic Studies: In cinema theory and analysis, feature-length films are compared to short films.
Festivals and Awards: Feature-length categories in film festivals are evaluated separately from short and documentary categories.

Literature: "Feature-length" can metaphorically describe a prolonged narrative.
Example: "My life feels like a feature-length film—complex and gripping."
Television Series: Some series produce special or finale episodes in a feature-length format.
Example: The 90-minute specials of the Sherlock series.
Advertising and Marketing: Feature-length advertisements or brand storytelling projects.

Colloquial Use: "I want to watch a feature-length film this weekend; do you have any recommendations?"
Technical Use: "At this festival, only feature-length films exceeding 90 minutes will compete."
Metaphorical Use: "Reading the novel felt like watching a feature-length film."