FR 658 then FR 1982 at Dublin
Brussels → Dublin → Biarritz
Timetable, Dublin time
17:05FR 658 from Brussels at the gate
12:40FR 1982 to Biarritz leaves the gate
19 h 35 apart on the timetable, overnight
FR 1982 leaves 19 h 35 after FR 658 arrives on the timetable: more than half a day, so not a connection we count.