An example
A Kestrel & Vane 12-second video gets 9,000 ThruPlays, each one a full watch. Its 45-second founder story gets 7,500 ThruPlays, but each of those only proves 15 seconds were watched. For the long video, the team adds the 75% and 95% video play columns to see how many people stayed to the offer.
Why it matters
ThruPlays show how many people gave the ad real time, not just a glance. The 15-second cap means a ThruPlay says more about a short video than a long one, so compare ThruPlays across videos of similar length and use percentage play columns for long videos.
How to improve it
Make the first 15 seconds carry the main message and show the product early. For short videos, cut to the length the story needs: a tight 12 seconds often earns more completions than a padded 20.