FR 44 then FR 729 at Vienna
Athens → Vienna → London Stansted
Timetable, Vienna time
07:25FR 44 from Athens at the gate
06:40FR 729 to London Stansted leaves the gate
23 h 15 apart on the timetable, overnight
FR 729 leaves 23 h 15 after FR 44 arrives on the timetable: more than half a day, so not a connection we count.