BA 1349 then BA 696 at Heathrow
Saint Helier → London → Vienna
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:50BA 696 to Vienna leaves the gate
20 h 30 apart on the timetable, overnight
BA 696 leaves 20 h 30 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.