IB 648 then FR 2513 at Madrid
Rome → Madrid → Bucharest
Timetable, Madrid time
14:35IB 648 from Rome at the gate
14:30FR 2513 to Bucharest leaves the gate
23 h 55 apart on the timetable, overnight
FR 2513 leaves 23 h 55 after IB 648 arrives on the timetable: more than half a day, so not a connection we count.