BA 634 then GQ 830 at Athens
London Heathrow → Athens → Milan
Timetable, Athens time
16:05BA 634 from London Heathrow at the gate
14:00GQ 830 to Milan leaves the gate
21 h 55 apart on the timetable, overnight
GQ 830 leaves 21 h 55 after BA 634 arrives on the timetable: more than half a day, so not a connection we count.