FR 1987 then FR 2971 at Dublin
Nantes → Dublin → Kaunas
Timetable, Dublin time
16:55FR 1987 from Nantes at the gate
16:35FR 2971 to Kaunas leaves the gate
23 h 40 apart on the timetable, overnight
FR 2971 leaves 23 h 40 after FR 1987 arrives on the timetable: more than half a day, so not a connection we count.