Thirty seconds is the magic number for a TV ad, but for online video, fifteen seconds is much more common. Undoubtedly this comes from the idea that people won’t tolerate watching anything longer when they can easily skip the ad with the push of a mouse button, but that thinking appears to be wrong.
According to a new study by FreeWheel, the length of a video ad had little impact on the ad’s completion rate. What did have a huge impact was the length of the video itself.
Long-form content (20+ minutes) had the best completion rates regardless of the ad length, both topping 82%. Short-form content, which is currently the most popular form of professional content, peaked at a completion rate of 61%.