FR 338 then FR 4501 at Dublin
London Luton → Dublin → Cologne
Timetable, Dublin time
18:20FR 338 from London Luton at the gate
11:05FR 4501 to Cologne leaves the gate
16 h 45 apart on the timetable, overnight
FR 4501 leaves 16 h 45 after FR 338 arrives on the timetable: more than half a day, so not a connection we count.