There is no way that "3 hours of planes taking off" or "3 hours of rain" are getting 10's of millions of views without getting recommended widely, including myself. 18 hours of "ambient sounds" has 130 million views so that's some heavy promotion, not just some occasional insomniac using search.
Now that's a video idea. I currently live right under the flight path for planes flying out of SFO; I should set up a camera and just record the sky, since they fly pretty close overhead.