BA 635 then EI 723 at Heathrow
Athens → London → Cork
Timetable, London time
18:55BA 635 from Athens at the gate
18:05EI 723 to Cork leaves the gate
23 h 10 apart on the timetable, overnight
EI 723 leaves 23 h 10 after BA 635 arrives on the timetable: more than half a day, so not a connection we count.