Some of the commenters on this video asked why anyone would waste 600 hours creating such a thing:
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But 5,173,197 people spent 7 minutes each watching it. Just counting the 43,189 people that liked it, he created 5039 hours of enjoyment. That's an 840% return on investment. I think any creation that gets even a 1 for 1 return of enjoyment time for work time is a success.