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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.
The Tri-State tornado (1925) is the longest continuous track left by a tornado ever recorded in the world, this is also the deadliest tornado in US history. The tornado traversed 219 miles (352km) across southeastern Missouri, southern Illinois and southwestern Indiana in about 3.5 hours.