The time to generate Audio Description (AD) depends on the length of your video. On average, AD takes approximately 1.25 to 1.5 times the length of the video to complete.
When does AD generation start?
If you request AD during the upload process, it begins automatically as soon as captions are ready.
If you request AD after that, it starts immediately after your request is made from the file page.
This makes it easy to plan and track the availability of your content.