FR 44 then FR 3766 at Vienna
Athens → Vienna → Sofia
Timetable, Vienna time
17:25FR 44 from Athens at the gate
13:05FR 3766 to Sofia leaves the gate
19 h 40 apart on the timetable, overnight
FR 3766 leaves 19 h 40 after FR 44 arrives on the timetable: more than half a day, so not a connection we count.