FR 6874 then FR 9615 at Dublin
Barcelona → Dublin → Rome
Timetable, Dublin time
21:40FR 6874 from Barcelona at the gate
16:20FR 9615 to Rome leaves the gate
18 h 40 apart on the timetable, overnight
FR 9615 leaves 18 h 40 after FR 6874 arrives on the timetable: more than half a day, so not a connection we count.