There is no single right length for a YouTube video, and nobody is going to work it out for you. A good length is the shortest one where you still get to say everything people came for. That number is one thing on a cooking channel, another on a coding channel, and it often changes between two videos on the same channel.
Why does this question matter so much?
The question keeps coming back because every guide answers it differently, and they all sound equally certain. One hands you a single number, the next a completely different one, the third a separate range for every type of video. Somewhere in all of that there should be a table with the right answer, except nobody has ever seen it.
It usually goes like this. The edit comes in at six minutes and has everything you had to say in it. Then you remember that longer videos supposedly earn more and get watched more, so you open the timeline again and add back two shots you cut on purpose the first time. Now it runs nine minutes, and it is worse than it was before.
That reflex makes sense. Length is the one thing in the whole process you can pin down exactly before you start, so it is easy to believe there has to be one correct value. Everything else - the topic, the promise, whether anyone clicks at all - counts for much less when you are starting out.
Those numbers do come from somewhere. Usually they are an average from some roundup that lines up channels with nothing in common: gear reviews, morning vlogs, coding courses, and a cooking channel with long recipes.
Somebody once noticed that longer videos collect more watch time, and turned that into advice: make your videos longer. The observation held up. The reasoning built on it has a serious hole in it, because what matters is how long videos run in your niche, not across YouTube as a whole.
Does YouTube reward longer videos?
Audience retention is the share of a video that a viewer actually watches. If two videos hold people for the same share of their running time, the longer one collects more watch time, and the longer you keep a viewer on a video, the harder YouTube pushes it.
The platform judges a video by how viewers behave, and those behaviors feed into each other. If nobody clicks the thumbnail, watch time is not going anywhere. And a click that ends with people bailing out in the first few seconds is bad news for YouTube, so a great thumbnail on its own will not carry the video.
And that is the catch with length. More minutes mean more places where the viewer can leave, and holding the same percentage across a longer video is harder. A longer video raises watch time on paper only, because the math assumes everything else stays the same.
A long video will work. What decides it is how many people make it to the end, and whether they still have the energy for the next video on your channel.
When you ask about a specific number of minutes, you are really asking something else: at what point does the viewer stop getting what they came for.
Why a shorter video often wins
A short video with something happening in every minute usually holds people longer than a long one. Retention is measured as a percentage of the whole video, so the longer the video, the harder that percentage is to hold.
Take a video that says everything it has to say in six minutes. A viewer leaves during the fourth minute, so they watched 66.7%.
Now stretch the same topic to twelve minutes with a longer opening and a few things said twice. The viewer still leaves at roughly the point where they get what they came for, so the percentage drops even though they watched the same number of minutes.
So cut ruthlessly: the padding, the dead air, the pauses where you are working out your next sentence, and anything you already said once in different words. Every minute you leave in for no reason drags down the number you will later try to fix with a new title and a new thumbnail.
Spread the promise from the title and the thumbnail across the whole video, piece by piece. A video that lays it all out in the first minute leaves nobody a reason to stick around.
The right length is your audience's length
Your video competes for the time of one specific group of people, not the average YouTube user. That group has a name: the avatar, a description of the viewer your channel was built for in the first place. You can generate one in a single click on Soku.pro. And you build the packaging, the title and the thumbnail together, to land with as much of that group as possible.
That is also why a channel that sticks to one niche has an easier time picking a length. You know who will watch your next video, because they watched the last ones, and you can see how long those particular people stay. Jump from topic to topic and every video draws a different audience, which leaves you nothing to compare against.
Look at the shape of the graph, not the average
The audience retention graph in YouTube Studio tells you more than the single number under it. A vertical drop in the first thirty seconds usually means the opening drags, or the thumbnail promised something that is not in the video. When the graph falls off in the middle, that part is either too long or it is not giving people what the video promised.
A gentle, even slide across the whole video is normal, and a good sign. The spikes that point up mark the places people rewound to watch something twice.
Compare and analyze
Compare your own videos back to back on retention. You want to know whether shorter videos hold people longer or whether your viewers prefer longer material, and where the graph starts falling apart. Somebody else's averages are no help here, because everything depends on the niche.
Do not judge the effect on a single video. Track the change over the next few weeks, because one shorter video that worked out proves nothing on its own. The topic had a hand in it, so did the packaging, and so did publishing it in the middle of a long weekend.
See what worked in your niche
To make this easier to check, add competitor channels to your follow list in Soku.pro and look at which of their videos broke out. You can also check how long a given channel's uploads usually run, which makes it easier to tune your own length to your viewers.