4.6 Billion hours watched.
There are 7 billion people on the planet, so that's 4.6 divided by 7, or .65 hours per person on the planet. And 0.65 hours is 39 minutes per person on Earth
The also say 12.5 videos viewed per person on earth, so that means there are 12.5 videos in 39 minutes. That works out each video being an average of 3 minutes and 9 seconds long.
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