EI 3391 then FR 634 at Dublin
Leeds → Dublin → Cardiff
Timetable, Dublin time
09:50EI 3391 from Leeds at the gate
06:50FR 634 to Cardiff leaves the gate
21 h apart on the timetable, overnight
FR 634 leaves 21 h after EI 3391 arrives on the timetable: more than half a day, so not a connection we count.