BA 1385 then BA 632 at Heathrow
Manchester → London → Athens
Timetable, London time
08:55BA 1385 from Manchester at the gate
08:15BA 632 to Athens leaves the gate
23 h 20 apart on the timetable, overnight
BA 632 leaves 23 h 20 after BA 1385 arrives on the timetable: more than half a day, so not a connection we count.