FR 406 then FR 8837 at Fiumicino
Copenhagen → Rome → Zagreb
Timetable, Rome time
17:35FR 406 from Copenhagen at the gate
12:00FR 8837 to Zagreb leaves the gate
18 h 25 apart on the timetable, overnight
FR 8837 leaves 18 h 25 after FR 406 arrives on the timetable: more than half a day, so not a connection we count.