Oppenheimer may be Nolan's longest film, with a running time of about three hours

Today (March 25), former Hollywood Reporter editor Matthew Belloni revealed the full length of Christopher Nolan's next film, Oppenheimer. According to the reporter, the film will be about three hours long - longer than Interstellar (2 hours and 49 minutes).

Belloni noted that this could change because some scenes and frames will be edited or added until the release. Oppenheimer has an A-list cast - Cillian Murphy, Emily Blunt, Matt Damon, Robert Downey Jr., Florence Pugh, Rami Malek, Gary Oldman, Casey Affleck and others star in the film. The film will be released on July 21.