A3 712 then LL 5506 at Barcelona
Athens → Barcelona → Seville
Timetable, Barcelona time
18:45A3 712 from Athens at the gate
07:15LL 5506 to Seville leaves the gate
12 h 30 apart on the timetable, overnight
LL 5506 leaves 12 h 30 after A3 712 arrives on the timetable: more than half a day, so not a connection we count.