FR 6596 then SN 3704 at Barcelona
Manchester → Barcelona → Brussels
Timetable, Barcelona time
23:40FR 6596 from Manchester at the gate
17:40SN 3704 to Brussels leaves the gate
18 h apart on the timetable, overnight
SN 3704 leaves 18 h after FR 6596 arrives on the timetable: more than half a day, so not a connection we count.