FR 1455 then FR 3977 at Dublin
Milan → Dublin → Barcelona
Timetable, Dublin time
16:30FR 1455 from Milan at the gate
07:40FR 3977 to Barcelona leaves the gate
15 h 10 apart on the timetable, overnight
FR 3977 leaves 15 h 10 after FR 1455 arrives on the timetable: more than half a day, so not a connection we count.