FR 932 then FR 8837 at Fiumicino
Cologne → Rome → Zagreb
Timetable, Rome time
18:40FR 932 from Cologne at the gate
16:20FR 8837 to Zagreb leaves the gate
21 h 40 apart on the timetable, overnight
FR 8837 leaves 21 h 40 after FR 932 arrives on the timetable: more than half a day, so not a connection we count.