Many television prints run 145 minutes, and omit the scene with James Stewart as Wyatt Earp. The video release is the full 154-minute version.
The original premiere, in Cinerama, ran a full 170 minutes. The film was cut by fifteen minutes following this premiere. The missing 15 minutes is presumed lost forever (check your attics). The only version now available is a VHS that runs around 155 minutes.