W4 6022 then FR 8837 at Fiumicino
Barcelona → Rome → Zagreb
Timetable, Rome time
17:10W4 6022 from Barcelona at the gate
16:20FR 8837 to Zagreb leaves the gate
23 h 10 apart on the timetable, overnight
FR 8837 leaves 23 h 10 after W4 6022 arrives on the timetable: more than half a day, so not a connection we count.