EI 643 then FR 3977 at Dublin
Prague → Dublin → Barcelona
Timetable, Dublin time
13:20EI 643 from Prague at the gate
08:50FR 3977 to Barcelona leaves the gate
19 h 30 apart on the timetable, overnight
FR 3977 leaves 19 h 30 after EI 643 arrives on the timetable: more than half a day, so not a connection we count.