FR 6921 then FR 8215 at Barcelona
Dublin → Barcelona → London Stansted
Timetable, Barcelona time
21:40FR 6921 from Dublin at the gate
19:10FR 8215 to London Stansted leaves the gate
21 h 30 apart on the timetable, overnight
FR 8215 leaves 21 h 30 after FR 6921 arrives on the timetable: more than half a day, so not a connection we count.