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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.
No terrain is safe from tornadoes. Never open windows in severe weather situations. This allows damaging wind and debris to enter the structure. 69% of all tornadoes are labeled weak tornadoes meaning they have a lifetime of 1-10+ minutes and winds less than 110 mph. 29% of all tornadoes are labeled strong tornadoes meaning they last 20 minutes or longer and winds reach 110-205 mph.