IB 655 then FR 8837 at Fiumicino
Madrid → Rome → Zagreb
Timetable, Rome time
19:30IB 655 from Madrid at the gate
19:00FR 8837 to Zagreb leaves the gate
23 h 30 apart on the timetable, overnight
FR 8837 leaves 23 h 30 after IB 655 arrives on the timetable: more than half a day, so not a connection we count.