Guide to Home Movie Running Times
fps = frames per second
"Silent" cameras usually ran at 18 frames.
Frame rate was not always consistent in the Super 8 and Standard/Regular 8mm formats.
Standard 8mm
50 foot/3-inch reel		 Super 8mm
50 foot/3-inch reel		 16mm
100 foot/3-inch reel
18 fps 18 fps 18 fps 24 fps
3.7 min. 3.3 min 3.7 min. 3 min.
Standard 8mm
400 foot/7-inch reel		 Super 8mm
400 foot/7-inch reel		 16mm
400 foot/7-inch reel
18 fps 18 fps 18 fps 24 fps
30 mins. 27 mins. 15 mins. 12 mins.