GQ 681 then A3 808 at Athens
Sofia → Athens → Stuttgart
Timetable, Athens time
21:55GQ 681 from Sofia at the gate
16:30A3 808 to Stuttgart leaves the gate
18 h 35 apart on the timetable, overnight
A3 808 leaves 18 h 35 after GQ 681 arrives on the timetable: more than half a day, so not a connection we count.