Hahaha, are you joking? If so I like - very funny!
If not joking continue reading.....
Joe Rogan tells a story about one of his expert online media mates who told him exactly that when he started doing youtube videos that were 2, 3 or 4 hours long.
I think 20 minutes probably applies if you do not have much to say or the content you have is simple.
However, many content providers record content in much longer format, and lo and behold the views keep flooding in......
Look through the interesting more scientific subjects and you will often see two plus hour interviews because many worthwhile subjects require that long to understand what is being discussed, and consider different aspects, points of view, research directions, etc etc.