If you reside in a historic district, to conduct work to the exterior of your historic property, you are required to obtain a Certificate of Appropriateness (COA). A COA is a special permit obtained in addition to the regular building permitting process.
The recommended arrival time at the airport is 75 minutes prior to departure when traveling within the United States. You must be checked in at least 30 minutes before your scheduled departure time.
This is an airport we're always 2+ hours early - even for a domestic flight. For a transatlantic flight, we're 2.5 - 3 hours early. Just getting to FCO can be a challenge. As Lee says, you certainly have to include your commute to the airport in your time-frame. Conversely, we can get through Copenhagen (CPH) quite quickly.