I2 1885 then FR 340 at Dublin
Madrid → Dublin → London Luton
Timetable, Dublin time
17:50I2 1885 from Madrid at the gate
15:00FR 340 to London Luton leaves the gate
21 h 10 apart on the timetable, overnight
FR 340 leaves 21 h 10 after I2 1885 arrives on the timetable: more than half a day, so not a connection we count.