FR 612 then FR 1982 at Dublin
Killarney → Dublin → Biarritz
Timetable, Dublin time
18:30FR 612 from Killarney at the gate
12:40FR 1982 to Biarritz leaves the gate
18 h 10 apart on the timetable, overnight
FR 1982 leaves 18 h 10 after FR 612 arrives on the timetable: more than half a day, so not a connection we count.