FR 6921 then FR 9015 at Barcelona
Dublin → Barcelona → London Stansted
Timetable, Barcelona time
21:40FR 6921 from Dublin at the gate
18:05FR 9015 to London Stansted leaves the gate
20 h 25 apart on the timetable, overnight
FR 9015 leaves 20 h 25 after FR 6921 arrives on the timetable: more than half a day, so not a connection we count.