FR 3977 then SN 3704 at Barcelona
Dublin → Barcelona → Brussels
Timetable, Barcelona time
21:10FR 3977 from Dublin at the gate
17:40SN 3704 to Brussels leaves the gate
20 h 30 apart on the timetable, overnight
SN 3704 leaves 20 h 30 after FR 3977 arrives on the timetable: more than half a day, so not a connection we count.