GQ 820 then FR 4891 at Fiumicino
Athens → Rome → Catania
Timetable, Rome time
12:00GQ 820 from Athens at the gate
11:35FR 4891 to Catania leaves the gate
23 h 35 apart on the timetable, overnight
FR 4891 leaves 23 h 35 after GQ 820 arrives on the timetable: more than half a day, so not a connection we count.