Videos with a duration between 21 to 34 seconds indicate a 280% lift in conversion and a 2% lift in impressions compared to videos with a duration shorter than 21 seconds and longer than 34 seconds.
Videos with a duration between 10 to 20 seconds are also effective for impressions. However, for best results, especially with the goal to drive more conversions – the recommended 21 to 32 seconds is best.