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Time-stretching keyframes
You can use the duration bar to proportionally adjust the keyframes associated with it. For example, suppose you have an object that is 4 seconds in duration, with keyframes at 1 second, 2 seconds, and 3 seconds. If you proportionally adjust the duration bar to make it 8 seconds long, the keyframes stretch to 2 seconds, 4 seconds, and 6 seconds, respectively.
To time-stretch keyframes:
- Alt-drag (Windows OS) or Option-drag (Mac OS) the start point
or the end point 
of the duration bar. The cursor changes to a double-headed arrow and stopwatch 
when it is over the end of the duration bar.