Attached Link: http://www.csgnetwork.com/animationkeycalc.html

> Quote - Your animation length is determined by frame rate so if you want 60 FPS you need to make sure you have 60 frames in the anim. You will get each frame in the animation rendered once.

 

Only if you set it to 60fps in playback. 60 frames will be 2 seconds at 30fps. Just adding to the above.

The best bet would be to determine how long you want you animation to be.  Then take it from there. You can use this to decide where to place your keys.