SN 3703 then FR 4587 at Barcelona
Brussels → Barcelona → Porto
Timetable, Barcelona time
16:50SN 3703 from Brussels at the gate
09:50FR 4587 to Porto leaves the gate
17 h apart on the timetable, overnight
FR 4587 leaves 17 h after SN 3703 arrives on the timetable: more than half a day, so not a connection we count.