A3 710 then FR 2507 at Barcelona
Athens → Barcelona → Cologne
Timetable, Barcelona time
10:25A3 710 from Athens at the gate
06:20FR 2507 to Cologne leaves the gate
19 h 55 apart on the timetable, overnight
FR 2507 leaves 19 h 55 after A3 710 arrives on the timetable: more than half a day, so not a connection we count.