I have never tried it and I am not sure people would watch the video that is that long. I am actually speaking from experience because my mind can't even stay there that long. Once the video is too long, I get distracted easily. Anything can take your attention along the line. It could be notification enter, next thing, you have leave the reel. But if the gist is very interesting, people will watch, but just making it too long doesn't mean it will perform. So, it's better to make every minute carrry some purpose instead of stretching content because there is an option for it.