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Quick Answer. Tornadoes can last from a few seconds to over an hour, although most last less than 10 minutes. They form from mesocyclones, which are areas of organized rotation within supercell thunderstorms. Scientists still don't know why some mesocyclones become tornadoes and some do not.
by dr maurizio grimaldi q how long does alzheimer s disease last on average a the sporadic form of alzheimer s disease on average given the state of good supportive care can last from 5 to 20 years the average calculated by the alzheimer s association is around 8 to 12 years