Glossary
What is average view duration?
By the KeyMo team · Updated
Average view duration is how long viewers typically watch a video per view, shown as a length of time such as 24 seconds or 6 minutes. YouTube calculates it from engaged views, so it covers viewers who stayed past the opening seconds. Average percentage viewed is the related figure that shows the same idea as a share of the video.
What YouTube counts
YouTube Help describes average view duration as the minutes watched among viewers who stayed, worked out from engaged views and their watch time. Engaged views are views where the viewer stayed past the initial seconds, and loops are not counted. The page does not say how many seconds that is. Average percentage viewed uses the same engaged views but reports the average share of the video watched.
Do not confuse engaged views with plain views. YouTube says that from 24 August 2026 a view is counted the moment a video starts to play, across Shorts, long videos and live streams. That is why average view duration can look lower than you expect: it is not an average across every start.
Duration versus percentage on clips of different lengths
| Video | Average view duration | Average percentage viewed |
|---|---|---|
| 40-second clip | 20 seconds | 50% |
| 90-second clip | 30 seconds | 33% |
| 60-minute episode | 20 minutes | 33% |
Raw duration favours longer videos. The 90-second clip holds viewers for ten seconds longer than the 40-second one, yet it kept a smaller share of its length. A clip can never hold viewers longer than it runs, so percentage is the fairer way to compare clips of different lengths. Use duration to compare clips of the same length.
- Pick the clips you want to compare and note their lengths.
- If the lengths match, compare average view duration.
- If they differ, compare average percentage viewed.
- Open the audience retention graph to see where the loss happened.
Why clip length changes the number
When you cut from a long recording, you choose the length. A shorter cut has a lower ceiling in seconds but a higher chance of a good percentage. KeyMo's length choices are Auto (15 to 90 seconds), Short (20 to 40), Medium (40 to 60) and Long (60 to 90). Keep the idea simple: end the clip when the point is made. Padding to reach a length lowers the percentage without adding anything.
Mistakes
- Comparing a 30-second clip's duration with a 5-minute video's duration.
- Treating one clip's number as a benchmark. YouTube's pages give no target, so track your own history.
- Mixing it up with watch time, which is a total, not an average.
Sources: YouTube Help: Understand your YouTube content performance (checked 11 October 2026); YouTube Help: Measure key moments for audience retention (checked 11 October 2026); YouTube Help: Get started creating YouTube Shorts (checked 11 October 2026).