Do 6–10 second video clips work for home service ads?

I'm not a facebook ad expert but I am working on it - My understanding is that the Ads need to have a value proposition and an offer. I don't think you'd be able to convey that in a short amount of time. By the time you introduce yourself, your service, and why you're great, you're already over 10 seconds. I think 30 second videos are great. Also having single photo ads in an ad set work great too.