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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.
Most Tornadoes in a Year. The record for the most tornadoes in a single year was set in 2004, when 1,817 tornadoes were confirmed. May was especially active that year, with 509 tornadoes â roughly double the 30-year average for the month.