The first thing most brands ask me is how many seconds their video should be. Fifteen? Thirty? A minute? It feels like there should be a right answer, a magic number that unlocks the feed. There isn’t. The number that actually decides how far your video travels is your UGC video completion rate, and it has very little to do with picking the perfect length up front.
I want to explain why, because once you understand what the platforms are really measuring, you stop chasing a length and start editing for the thing that moves the needle.
What 6 million videos actually show.
Socialinsider looked at more than 6 million TikTok videos posted by brand accounts between January and June 2026, and the data pulls in two directions at once. If you care about engagement, the 15 to 30 second range wins, with a 6.00% engagement rate. Sit just past that, in the 30 to 60 second band, and engagement drops to 4.20%. That middle stretch is the danger zone: too long to feel snappy, too short to give anyone a reason to stay.
But views tell a different story. Median views climb steadily with length, from around 1,000 for a 15 to 30 second clip up to 11,136 for a two to three minute video. That is more than eleven times the reach, off the back of length alone. So a short video earns the likes and comments, and a longer one gets seen by more people. Same platform, opposite advice, depending on what you are actually trying to win. You can read the full breakdown in Socialinsider’s 2026 study.
Why completion is the signal underneath both.
Here is the part that ties it together. TikTok is running two scoring logics side by side, and completion rate sits at the heart of one of them. In its own explainer of how the For You feed works, TikTok says finishing a video from beginning to end is one of the strongest interest signals in the whole system. A tight 30 second video is easy to finish, so when the payoff lands and people are still watching, they like, comment and share. That is why short videos top the engagement chart.
Longer videos work on accumulated watch time instead. A two minute video that holds attention banks far more total watch time than a 30 second one ever could, even if fewer people make it to the very end, and that pile of watch time is what gets it pushed out to more feeds. Both routes reward the same underlying thing: people watching, and watching for longer. Length is just the lever. Watch-through is the point.
This is exactly why a random length lifted from a trend so often flops. A 90 second video that only holds people for 12 seconds tells the algorithm the content is weak, whatever its runtime says. The clock is not the score. What people do with those seconds is.
How I edit for watch-through.
When I cut a UGC video, completion is the thing I am protecting from the first frame to the last. It starts with the hook, because if the first two seconds do not earn the next two, nothing after them matters. I have written before about the hooks that stop the scroll, and they are the single biggest lever on whether anyone sticks around long enough to finish.
After that, it is about never giving a reason to leave. I cut the dead air between sentences so the pace never sags. I use captions so the video holds people watching with the sound off, which is most of them. I plant a small open loop early, a question or a promise, and I pay it off at the end so there is a reason to stay for the whole thing. And I am ruthless about length: if a section is not earning its place, it goes, because a shorter video people finish beats a longer one they abandon. That is the whole idea behind editing for retention, and it is where a real edit quietly does its work.
So how long should your video be?
Match the length to the job, not to a trend. If you want engagement and shares, aim for that 15 to 30 second window and make every second count so people reach the end. If you want reach and you have something with real substance to say, a tutorial, a proper story, a walkthrough, then two to three minutes can pull far more views, as long as the content genuinely holds people that long. Where your video lives matters too, since a clip that thrives on TikTok might need a different cut for Reels or Shorts, which I broke down in this comparison.
What does not work is picking a number because it worked for someone else, then hoping the algorithm rewards you for hitting it. It won’t. It rewards the video people actually watch to the end. Decide what you want the video to do, then build every cut around keeping people there.
If you would rather hand that part to someone who lives in the timeline, that is what I do. I film and edit UGC that is built to be finished, not just started. Take a look at the packages or email me at [email protected] and tell me what you are trying to get watched.
