FR 7156 then IB 721 at Madrid
Dublin → Madrid → London Heathrow
Timetable, Madrid time
20:40FR 7156 from Dublin at the gate
15:50IB 721 to London Heathrow leaves the gatealso LA 1701, VY 5176, DT 6160, QR 6906, BA 7068, AA 8652
19 h 10 apart on the timetable, overnight
IB 721 leaves 19 h 10 after FR 7156 arrives on the timetable: more than half a day, so not a connection we count.