Setting the composition's duration

The length of the composition's duration bar specifies how long the composition lasts as an animation, as opposed to how long the individual objects within it last. By default, LiveMotion adjusts the composition's duration to match the length of the objects it contains. When you adjust the duration manually, you make the duration explicit (indicated by the differently shaped end handle). (See Changing an object's duration between explicit and implicit.)

To set the composition's end point:

In the Timeline window, drag the end point of the composition's duration bar to specify the time at which the composition ends.