After Effects Timeline Duration – How to Extend a Composition (For Beginners)
In this After Effects beginner tutorial, you’ll learn how to check and change the duration of a composition — an essential skill for working with timelines, animations, and longer projects in Adobe After Effects.
This video explains composition duration in a simple, visual, and beginner-friendly way, so you understand how time works in After Effects and avoid common mistakes.
In this tutorial, you’ll learn:
What composition duration is in After Effects
How to check the full length of a composition using the End key
Where to see the composition duration in the timeline
How to open Composition Settings
How to change composition duration using Ctrl + K
How to enter time values and read them correctly (for example, 13000 = 1:30)
Why changing composition duration does not change layer duration automatically
How to extend layers to match the new composition length
This tutorial is perfect if you’re new to After Effects and want a clear explanation without technical language or complicated steps.
🎯 New to After Effects? Start here first:
After Effects Basics Tutorial for Beginners
👉 • Video
This basics video explains layers, compositions, and the most common beginner mistakes — and will make this tutorial much easier to follow.
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