How to change length of a composition in After Effects
If you want to extend the length of a composition in Adobe After Effects, you need to actually set a new duration for the composition.
The easiest way of doing this is to right-click on your composition and go down to “Composition settings”, or click “Cmd + K”.
A window will pop up and here you can change the duration of your composition by changing the hours, minutes, seconds or frames.
Then click OK and drag out the top bar in your composition window all the way to the right to see the whole composition.
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