IB 653 then FR 8837 at Fiumicino
Madrid → Rome → Zagreb
Timetable, Rome time
18:10IB 653 from Madrid at the gate
12:00FR 8837 to Zagreb leaves the gate
17 h 50 apart on the timetable, overnight
FR 8837 leaves 17 h 50 after IB 653 arrives on the timetable: more than half a day, so not a connection we count.