FR 1983 then FR 1976 at Dublin
Biarritz → Dublin → Riga
Timetable, Dublin time
17:20FR 1983 from Biarritz at the gate
13:50FR 1976 to Riga leaves the gate
20 h 30 apart on the timetable, overnight
FR 1976 leaves 20 h 30 after FR 1983 arrives on the timetable: more than half a day, so not a connection we count.