"Feature length" refers to the duration of a movie or film that is long enough to be shown in theaters, typically lasting around 90 minutes or longer. Full definition
She gives an award worthy performance in her first feature length film. (amovieguy.com)
They claim that their movie is the first feature length narrative film to give the public an opportunity under the new rules to invest in it. (livingrichcheaply.com)
Customers have been begging the company for years to start providing feature length movies. (goodereader.com)