FR 1557 then FR 1982 at Dublin
Manchester → Dublin → Biarritz
Timetable, Dublin time
15:25FR 1557 from Manchester at the gate
12:40FR 1982 to Biarritz leaves the gate
21 h 15 apart on the timetable, overnight
FR 1982 leaves 21 h 15 after FR 1557 arrives on the timetable: more than half a day, so not a connection we count.