Estimated running time of a single 15 m (50 ft) film cartridge at the most typical frame rates:
18 frames per second = 3min 20s
24 frames per second = 2min 30s
25 frames per second = 2min 24s
(Calculated running times, may vary by camera model)
Download PDF: KODAK 7219 Technical Data
NOTE: The film is developed as a negative so it is not directly viewable on a projector because its colors are inverted (hence negative).
After development the negative film can be scanned into a digital format in which the colors are turned to normal.
See the page “Color negative film processing + scan”.