What is the legal length for a shotgun in Florida?

In the United States, it is illegal for a private citizen to possess a sawed-off modern smokeless powder shotgun (a barrel length less than 18 in. or 46 cm and an overall length less than 26 inches) without a tax-stamped permit from the Bureau of Alcohol, Tobacco, Firearms, and Explosives, which requires an extensive background check and a $200.00 fee for every transfer.

http://en.wikipedia.org/wiki/Sawed-off_shotgun