I just checked my nearest major airports online. Fort Lauderdale (FLL) doesn't list any limit. Miami International (MIA) shows 60 days. Tampa (TPA) says 45 days. And Orlando (MCO) is 60 days in the garage and 120 days in their economy lot.

If no one here knows, you might try contacting one or more airports and asking directly. If you're really curious, you might do that anyway. Primary sources are usually best.