FR 7073 then FR 340 at Dublin
Porto → Dublin → London Luton
Timetable, Dublin time
23:00FR 7073 from Porto at the gate
15:00FR 340 to London Luton leaves the gate
16 h apart on the timetable, overnight
FR 340 leaves 16 h after FR 7073 arrives on the timetable: more than half a day, so not a connection we count.