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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.
F5: Incredible tornado (261-318 mph). Incredible damage. About 70 percent of tornadoes are weak and last between one and 10 minutes. About 10 percent of tornadoes are strong and last 20 minutes or more. Only two percent of tornadoes are considered violent. Violent tornadoes cause the most deaths and can last for well over an hour.