FR 1000 then FR 8837 at Fiumicino
Valencia → Rome → Zagreb
Timetable, Rome time
21:15FR 1000 from Valencia at the gate
20:30FR 8837 to Zagreb leaves the gate
23 h 15 apart on the timetable, overnight
FR 8837 leaves 23 h 15 after FR 1000 arrives on the timetable: more than half a day, so not a connection we count.