Fla. Stat. § 153.71
Prior to the issuance of any revenue bonds, general obligation bonds, assessment bonds or other obligations, the district board may, in its discretion, publish a notice at least once in a newspaper published in the county and circulating in the district, or posted in the manner provided in s. 153.56 if there be no such newspaper, stating the date of adoption of the resolution authorizing such obligations, and the amount, maximum rate of interest and maturity of such obligations and the purpose in general terms for which such obligations are to be issued, and further stating that any action or proceedings authorizing the issuance thereof, or of any covenants made therein, must be instituted within 20 days after the first publication of such notice, or the validity of such obligations or proceedings or covenants shall not be thereafter questioned in any court whatsoever. If no such action or proceeding is so instituted within such 20-day period then the validity of such obligations, proceedings and covenants shall be conclusive, and all persons or parties whatsoever shall be forever barred from questioning the validity of such obligations, proceedings or covenants in any court whatsoever.
Fla. Stat. § 153.71