What is watch time?

Platforms calculate watch time for you, but it helps to know how it relates to other numbers.

Platforms measure this for you from the actual playback data, so the platform figure is more accurate than multiplying an average back up. Use the manual calculation only to sanity-check or to compare platforms that report the numbers differently.

1. Watch time = the sum of every second watched across all views.
2. If you only know views and average watch time, multiply them: views × average watch time.
3. To compare videos of different lengths, divide watch time by views to get the average, then compare the average with the video's length.

These are the names and places each platform's help centre uses:

• YouTube: in YouTube Studio, select Analytics from the left menu. Watch time (hours) is in the Overview key metrics. For one video, select Content, open the video's Analytics, then the Engagement tab.
• Instagram: open a reel from the Reels tab on your profile and select View insights. Watch time is the total time the reel was played, including replays.
• LinkedIn: Page analytics reports Time viewed for video posts, the cumulative length of time your video was viewed, including sponsored and organic views.
• TikTok: open Analytics in TikTok Studio, or tap More insights at the bottom of a post on your profile, to see that video's performance.

Total watch time grows with views, so on its own it mostly tells you how big a video was. For quality, look at average view duration and retention. YouTube's audience retention report lets you compare a video with typical retention, which YouTube bases on your 10 latest videos of similar length, a fair baseline built from your own channel.

Longer videos can collect more watch time per view, but only if people stay. A 30-second video that most viewers finish can be a better use of everyone's time than a 5-minute video they leave after 20 seconds. Choose the length the topic needs, then check average view duration and retention to see whether viewers agreed.

Watch time is easy to misread:

• Comparing total watch time between a 15-second clip and a 10-minute video.
• Forgetting that replays count on some platforms (Instagram includes them), which flatters looping short videos.
• Padding videos to make them longer. If viewers leave early, the extra length does nothing.