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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.
Tornadoes can last for a minute or an hour, and they can tear a damage path up to 10 miles (16 kilometers) long. Tornadoes forming over warm water are known as waterspouts, and are most common in southern states and along the Gulf Coast.