FR 555 then FR 1976 at Dublin
Manchester → Dublin → Riga
Timetable, Dublin time
19:45FR 555 from Manchester at the gate
18:00FR 1976 to Riga leaves the gate
22 h 15 apart on the timetable, overnight
FR 1976 leaves 22 h 15 after FR 555 arrives on the timetable: more than half a day, so not a connection we count.