FR 4857 then GQ 821 at Fiumicino
Catania → Rome → Athens
Timetable, Rome time
15:55FR 4857 from Catania at the gate
13:00GQ 821 to Athens leaves the gate
21 h 05 apart on the timetable, overnight
GQ 821 leaves 21 h 05 after FR 4857 arrives on the timetable: more than half a day, so not a connection we count.