BA 1401 then BA 446 at Heathrow
Belfast City → London → Amsterdam
Timetable, London time
18:25BA 1401 from Belfast City at the gate
17:45BA 446 to Amsterdam leaves the gate
23 h 20 apart on the timetable, overnight
BA 446 leaves 23 h 20 after BA 1401 arrives on the timetable: more than half a day, so not a connection we count.