FR 6874 then FR 3568 at Dublin
Barcelona → Dublin → Santiago de Compostela
Timetable, Dublin time
21:40FR 6874 from Barcelona at the gate
18:50FR 3568 to Santiago de Compostela leaves the gate
21 h 10 apart on the timetable, overnight
FR 3568 leaves 21 h 10 after FR 6874 arrives on the timetable: more than half a day, so not a connection we count.