FR 4855 then AZ 1677 at Fiumicino
Catania → Rome → Firenze
Timetable, Rome time
17:10FR 4855 from Catania at the gate
13:50AZ 1677 to Firenze leaves the gate
20 h 40 apart on the timetable, overnight
AZ 1677 leaves 20 h 40 after FR 4855 arrives on the timetable: more than half a day, so not a connection we count.