A3 981 then A3 670 at Athens
Sofia → Athens → Venezia
Timetable, Athens time
12:30A3 981 from Sofia at the gate
10:30A3 670 to Venezia leaves the gate
22 h apart on the timetable, overnight
A3 670 leaves 22 h after A3 981 arrives on the timetable: more than half a day, so not a connection we count.