A3 712 then FR 4545 at Barcelona
Athens → Barcelona → Porto
Timetable, Barcelona time
18:45A3 712 from Athens at the gate
09:20FR 4545 to Porto leaves the gate
14 h 35 apart on the timetable, overnight
FR 4545 leaves 14 h 35 after A3 712 arrives on the timetable: more than half a day, so not a connection we count.