FR 331 then FR 7078 at Dublin
London Luton → Dublin → Porto
Timetable, Dublin time
17:15FR 331 from London Luton at the gate
06:30FR 7078 to Porto leaves the gate
13 h 15 apart on the timetable, overnight
FR 7078 leaves 13 h 15 after FR 331 arrives on the timetable: more than half a day, so not a connection we count.