FR 339 then FR 5217 at Dublin
London Luton → Dublin → Lublin
Timetable, Dublin time
20:30FR 339 from London Luton at the gate
17:35FR 5217 to Lublin leaves the gate
21 h 05 apart on the timetable, overnight
FR 5217 leaves 21 h 05 after FR 339 arrives on the timetable: more than half a day, so not a connection we count.