Here is the link from the closed thread, how long would the planet be in darkness if this were to be a major eruption?
Edit: after watching the The History Channel video, the answer to my question is 6 years.
Quote:
"I am advising all State officials around Yellowstone National Park for a potential State of Emergency. In the last week over 252 earthquakes have been observed by the USGS. We have a 3D view on the movement of magma rising underground. We have all of the pre warning signs of a major eruption from a super volcano. - I want everyone to leave Yellowstone National Park and for 200 miles around the volcano caldera."
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http://www.worldwidewaterplan.com/yellowstone.htm