Most social media videos should run between 15 and 60 seconds, short enough to hold attention, long enough to land one clear message. Platform sweet spots differ: roughly 15 to 30 seconds for Instagram Reels and TikTok, 30 to 90 seconds for LinkedIn, and up to several minutes on YouTube where viewers arrive with intent.
Length should follow viewer intent on each platform rather than a universal rule.
Platforms distribute videos based on how much of them people watch, not how long they are. A 20-second video watched to the end outperforms a 60-second video abandoned at the halfway mark. That makes the first three seconds the highest-value real estate in the entire edit: open on the strongest visual, the boldest claim or the problem itself, and save the logo for the end.
The efficient approach is never to produce one video per platform from scratch. Plan a hero film, then derive cutdowns: a 15-second hook version, a 30-second story version, a 60-second full version, each delivered in 9:16, 1:1 and 16:9 as the placement demands. At Viven we plan this versioning before the shoot, which is how a brand like FIFA or ON gets a full campaign matrix out of a single production rather than a single asset.
Length rules bend when intent is high. Product deep-dives, tutorials and documentary-style brand stories can run minutes and still hold, because the viewer chose them. The honest test is editorial, not arithmetic: cut every second that does not earn its place, and the video is the right length when nothing removable remains. If a topic genuinely needs three minutes, publish the full version on YouTube or your site and let the short social cuts act as trailers driving viewers there.
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