This is less about "customer demand" and more about having to meet minimum video length for mid-clip monetization slots. Strictly an artifact of how YouTube works.
I once had YouTube on in the background and an advert which was an hour long popped up - but I was focused on something else and away from the screen and the tv remote.
The advert? A video of someone pointing a camera outside of a window during the night and onto a dark street (no sounds other than rustling from the person holding the camera). An hour long of it.
Skip.
It was soon after this I paid up.