All videos on Facebook that are 30 seconds or shorter will loop continuously. This includes videos shared organically as well as video ads. Looping means that your video will replay once it reaches the end. Videos will loop continuously for up to approximately 90 seconds on Facebook.

Example 1: Let's say you have a 10-second video. Your 10-second video will loop 9 times for a total of 90 seconds.

10 seconds x 9 loops = 90 seconds.

Example 2: Now, let's say you have a 16-second video. Your 16-second video will loop 6 times for a total of 96 seconds.

16 seconds x 6 loops = 96 seconds.*

16 seconds x 5 loops = 80 seconds.*

*6 loops wins in this example because 96 seconds is closer to 90 than 80 seconds.

What will happen to my video ad's Call to Action button if my video loops continuously?

You can still add a Call to Action button to your video ads. The following objectives support Call to Action buttons when you choose video as your creative: Website Clicks, Website Conversions, App Installs, App Engagement, Local Awareness, Brand Awareness and Video Views. Your Call to Action button will appear in the bottom-right corner below your video.

Bear in mind that videos over 30 seconds won't loop. Once your video has finished playing, your video's thumbnail will appear with a play button.

* Nguồn: Facebook