FR 11 then FR 1982 at Dublin
Madrid → Dublin → Biarritz
Timetable, Dublin time
16:00FR 11 from Madrid at the gate
12:40FR 1982 to Biarritz leaves the gate
20 h 40 apart on the timetable, overnight
FR 1982 leaves 20 h 40 after FR 11 arrives on the timetable: more than half a day, so not a connection we count.