BA 549 then BA 740 at Heathrow
Rome → London → Geneva
Timetable, London time
14:05BA 549 from Rome at the gate
13:55BA 740 to Geneva leaves the gate
23 h 50 apart on the timetable, overnight
BA 740 leaves 23 h 50 after BA 549 arrives on the timetable: more than half a day, so not a connection we count.