A3 712 then FR 2507 at Barcelona
Athens → Barcelona → Cologne
Timetable, Barcelona time
18:45A3 712 from Athens at the gate
14:10FR 2507 to Cologne leaves the gate
19 h 25 apart on the timetable, overnight
FR 2507 leaves 19 h 25 after A3 712 arrives on the timetable: more than half a day, so not a connection we count.