BA 1347 then BA 694 at Heathrow
Saint Helier → London → Vienna
Timetable, London time
11:50BA 1347 from Saint Helier at the gate
10:30BA 694 to Vienna leaves the gate
22 h 40 apart on the timetable, overnight
BA 694 leaves 22 h 40 after BA 1347 arrives on the timetable: more than half a day, so not a connection we count.