How to modify the times of the animation curves.
 , and a new time warp curve
               is created. This time warp curve is now applied to all channels
               of all active items.
               Cycle sections of animation with a time warp
To change the range of animation to be cycled
 .
               A new time warp curve is created that will be applied to all specified channels of the selected animated items. These channels now cycle through the animation between frames 1 and 30 twice before continuing on with the remainder of the animation.
An alternate way to cycle the complete range of animation on a channel for an infinite (or undetermined) number of times is to use the Cycles or Oscillate out-of-range type on the base action of a channel, instead of applying a timewarp. See the Action Tools menu items in the Action Window. For more information on timewarp curves, see
Scale animation timing with a time warp
To set new scale warps
  ❒ to
               display the Time Scale Options window. 
            These channels are now all scaled by 2, which means that their animation now takes twice as long to play back.
  to scale the channels. See Animation > Editors > Action Window  
  for details.