EI 3325 then FR 340 at Dublin
Manchester → Dublin → London Luton
Timetable, Dublin time
18:25EI 3325 from Manchester at the gate
14:40FR 340 to London Luton leaves the gate
20 h 15 apart on the timetable, overnight
FR 340 leaves 20 h 15 after EI 3325 arrives on the timetable: more than half a day, so not a connection we count.