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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.
It is not that simple as tornadoes don't occur at a very regular rate. The U.S. averages about 1200 tornadoes per years which works out to an average of about 3.3 per day. A â¦ ccurate global statistics are not available as many countries do not keep records of tornadoes.It is far from an even distribution, though.he U.S. averages about 1200 tornadoes per years which works out to an average of about 3.3 per day. A â¦ ccurate global statistics are not available as many countries do not keep records of tornadoes. It is far from an even distribution, though.