In a Mobile-First World, Shorter Video Ads … – facebook.com

The team ran a test with 6-second, 15-second and 30-second ads, and the 6-second ad performed the best. The video ad campaign for Netmarble’s Lineage2 Revolution broke records as the MMORPG (massively multiplayer online role-playing game) with the most downloads in both the App Store and Google Play in five Southeast Asian countries.

https://www.facebook.com/business/news/in-a-mobile-first-world-shorter-video-ads-drive-results