Knowledge Bank
5 min read
How long should a YouTube video be? As long as the idea holds
The eight-to-ten-minute rule is dead weight. Your video should be as long as its single idea can hold, and no longer. Why padding is what kills retention.
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The honest answer to how long your video should be is the length your one idea can hold, and not a minute more. The eight-minute mid-roll threshold is still live, so the revenue behind it is real. What has aged badly is treating that number as a runtime target and filling the gap with material you did not have. That is one of the most common ways creators sabotage their own retention.
Length is an output, not an input. You work out how long a video should be by looking at what you actually have to say, then you film that. Picking the number first and writing to fill it is backwards, and viewers feel the difference within the first couple of minutes.
Why padding hurts you
When you stretch a six-minute idea to hit twelve minutes, the extra six minutes are filler by definition. You did not have anything else to say; you added words to reach a number. Viewers leave during exactly those stretches, and that exit shows up as a visible slump in the middle of your retention graph. The graph is reading your padding back to you.
The tempting logic is that a longer video earns more watch time. It only does that if people stay. A padded twelve-minute video can still post strong raw watch time, and that is exactly the trap. YouTube has said padding a runtime lowers a video's satisfaction-survey scores, and the flat retention curve it leaves behind gets the video deprioritised over time even while the watch-time number looks healthy. Longer is more watch time only when the extra minutes are as good as the first ones, which padding never is.
The old rule versus what actually decides it
The fixed-runtime habit is worth retiring on purpose, because it quietly shapes a lot of bad decisions. Here is the swap.
| The old rule | What actually decides it |
|---|---|
| Pad past eight minutes so the video qualifies for mid-roll ads, which has been the threshold since 2020. | How much your single idea can genuinely hold before it repeats itself. |
| Longer videos always earn more watch time. | Watch time is length multiplied by how many people stay; padding kills the second half. |
| A short video looks lazy or low effort. | A tight video that respects the viewer's time reads as confident and gets finished. |
| Match the runtime of bigger channels in your niche. | Match the depth your specific idea deserves; their idea is not your idea. |
How to estimate length from your outline
You can predict a runtime before you film, straight from your outline, and it is more accurate than guessing. The beats in your outline each carry a rough cost in minutes. Add them up and you have a realistic target instead of an arbitrary one.
- Count your beats. A typical talking-head point runs one to two minutes once you allow for setup, the point itself, and a quick example. List the points your idea actually contains.
- Price the heavy bits. A demonstration, a tutorial step, or a story takes longer than a stated point. Give those a fairer estimate of two to four minutes each.
- Add the frame. Your hook, any quick context, and the close together cost roughly a minute. Do not let them sprawl.
- Total it, then sit with the number. If the sum is five minutes, the video is five minutes. If that feels too short to be worth making, the honest move is to find a bigger idea, not to inflate a small one.
This is also a useful gut check on the idea itself. An outline that only totals two or three minutes is telling you the idea is thin. That is a planning signal worth catching before you film, which is the same instinct behind learning to test a video idea early.
When longer genuinely is right
None of this means short for the sake of it. Some ideas earn a long runtime honestly. A deep tutorial, a documentary-style breakdown, a thorough review of a complicated thing: these can run twenty, thirty, even forty minutes and hold the whole way, because every minute is delivering. The test is never the clock. The test is whether you could remove a section and lose nothing the viewer wanted. If yes, cut it. If no, keep it, however long that makes the video.
Where Chewbr fits
Chewbr keeps length a planning decision rather than an editing-room regret. The workflow has you outline and estimate the runtime before you film, so you walk onto set knowing roughly how long the finished video should be and what each section is worth. When you sit down to edit, you are trimming to a length the idea earned, not trying to rescue a runtime you padded to from the start.
Keep reading
With a target length in mind, work out what you need to film: the one-page shot list saves you a second filming day. Padding to hit a runtime tends to show up later as the slump in your retention graph, so film only what the idea needs.