Jumping times: An article by Ben Cousins in Develop Magazine (August 2002) examined this. The author found that hit games with well-received gameplay had level lengths clustering around 1 minute and 10 seconds, characters that jump have elapsed time in the air clustering around 0.7 seconds, and the elapsed time to perform three combat moves in succession clustered around 2 seconds. He suggests that these should be considered constants for good gameplay.
