One of the most common questions we hear from clients is simple: how long should a video be? There is no single answer, because every platform has its own audience, its own viewing habits, and its own algorithm that rewards different content lengths. A video that performs brilliantly on TikTok can fall flat on LinkedIn, and the reverse is just as true.

In this article we break down concrete numbers for each major platform and explain why length matters so much for how many people actually watch a video all the way through.

Why length matters more than you think

Social media algorithms do not simply measure clicks, they measure what share of a video people actually watch. This is called the retention rate. If a video is too long and viewers drop off halfway through, the algorithm concludes the content is not engaging and stops showing it to new audiences. That is why a shorter, fully watched video often reaches more people than a longer one with a weak retention rate.

Instagram Reels: 15 to 30 seconds

The Instagram Reels algorithm rewards videos that get watched to the end and then replayed. The sweet spot for most brand content is 15 to 30 seconds. If a story genuinely needs more time, such as a product demo, you can stretch to 60 seconds, but every extra second has to earn its place with useful information or a visual surprise.

Practical tip

The first three seconds decide whether a viewer stays. Open with a strong visual hook, not with a logo or a slow intro.

TikTok: a reliable 21 to 34 seconds, but longer works too

TikTok research shows videos between 21 and 34 seconds often strike the best balance between holding attention and delivering enough information. Unlike Reels, though, TikTok also rewards longer formats when content is educational or entertaining, since the platform allows videos up to 10 minutes. Businesses should experiment with two versions: a tight 20-30 second cut for broad reach and a 2-3 minute version for a deeper product story.

YouTube: long form versus Shorts

YouTube is unique because it hosts two completely different formats side by side. YouTube Shorts, like Reels, perform well in the 15-60 second range. Long-form videos, such as a company story or a detailed product review, statistically hold viewers best at around 7 to 15 minutes. Shorter videos (under 3 minutes) are often treated as lower value by the long-form algorithm, while overly long videos (over 20 minutes) need very strong storytelling to keep attention to the end.

LinkedIn: 30 to 90 seconds

LinkedIn's audience is professional and has less patience than TikTok or Instagram users. Videos between 30 seconds and a minute and a half work best here, delivering one clear idea or one case study without detours. Longer videos on LinkedIn should be used carefully and structured with a clear headline in the opening seconds.

Facebook: flexible, but with its own rules

Facebook's audience tends to be older and watches video both in the feed and in Stories format. Feed videos of 1 to 2 minutes still perform well, especially with captions, since a large share of users watch without sound.

How to choose the right length for your business

  • Identify the main platform where your target audience actually spends time, and tailor length to that platform first.
  • Always film with extra footage in reserve so one shoot can produce both a short and a long version.
  • Track the retention rate in your account analytics, not just the raw view count.
  • Test two different lengths for the same message and compare results after two weeks.

Our team regularly produces social media video for clients, factoring in each platform's specifics already at the shoot-planning stage so a single production delivers maximum value across every channel.

If you need advice on which video format and length suits your business and audience, get in touch with us for a free consultation.