noun
long work; full-length novel; feature-length film; long poem
Refers to a long-form work in any medium: novels, films, poems, etc. Often contrasted with 短編 (short work).
See also: 短編
彼の新しい長編小説が来月発売される。
His new full-length novel will be released next month.
この監督は長編映画で有名だ。
This director is famous for feature-length films.