This is how key frame spacing is important and effects an animation. It the frames are close together then the motion will be fast and if the key frames are apart the motion will be slow. The idea is to find the right speed. This can be done as a calculation although it is instinctive after a while.
If a animation is set at 30 frames per second then 30 frames will be showed every second. This means a key frame set at frame 0 to a key frame at frame 30 will take exactly 1 second.
Here are some formulae I use in my head to quickly determine the optimal frames per second and the spacing required.
To determine animation length. AL = Frames/Fps
To determine frame rate this can be used backwards. Fps= AL x Frames
To work out how long a motion will take. You first work out the timing in seconds. This can be done mentally or you can act out the motion and count for an estimate. Then use this estimated motion time to times it by the frames per second. So a motion of waving takes 3 seconds. If the animation is set to run at 24 frames per second then you will need that motion to be set between 72 frames.
Frames needed for motion = Time taken for motion x Frames per second.
Example in formula: 3s x 24fps = 72 frames
These are all being used all the time when animating. The computer actually helps a lot with this using time lines and real time previews for trial and error.
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