5 - 8. I was concerned at first. But there's so many of these on YouTube that have pretty high view counts, that my worry pretty quickly went from "my friend's kids are weird" to "kids are weird".
This kind of reminds me of having a few favourite VHS tapes and watching them over and over as a little kid.
I used to think it was disconcerting, but I also had peers that did the same and turned out alright, so I wonder if it's part of figuring out stimulus/work/gratification/reward/effort as a child and eventually growing into an adult.
