How to Extend AI Video Length Without Breaking the Story

The first AI video model I ever loved gave me a beautiful 5-second clip. The second one gave me 8 seconds. By the time Seedance 2.0 landed, I could push a single shot up to 15 seconds with consistent characters and clean physics. That is enough for a hero ad cut, a sizzle reel, or an opening shot. It is nowhere near enough for a full scene, a multi-shot ad, or a YouTube intro. So the question I…