August 1, 2012 by Sam Laird Like+1SharePin ItShareYouTube users now watch more than four billion hours of video through the site each month. For those of you keeping score at home, that’s 456,000 years of cat videos, sports highlights, TED Talks and other content per month. Or, the equivalent of watching the original Nyan Cat video about 66 billion times. First reported as a casual mention in a Wall Street Journal article earlier this week, a YouTube spokesperson confirmed the number to Mashable on Wednesday. And things are moving fast with the video sharing giant — the company just announced in May that users were watching a piddling three billion hours of footage per month.