EC 3749 then A3 711 at Barcelona
Milan → Barcelona → Athens
Timetable, Barcelona time
21:30EC 3749 from Milan at the gate
11:20A3 711 to Athens leaves the gate
13 h 50 apart on the timetable, overnight
A3 711 leaves 13 h 50 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.