FR 331 then FR 5346 at Dublin
London Luton → Dublin → Katowice
Timetable, Dublin time
17:15FR 331 from London Luton at the gate
05:55FR 5346 to Katowice leaves the gate
12 h 40 apart on the timetable, overnight
FR 5346 leaves 12 h 40 after FR 331 arrives on the timetable: more than half a day, so not a connection we count.