BA 807 then UA 4 at Heathrow
Copenhagen → London → Houston
Timetable, London time
12:35BA 807 from Copenhagen at the gate
12:05UA 4 to Houston leaves the gate
23 h 30 apart on the timetable, overnight
UA 4 leaves 23 h 30 after BA 807 arrives on the timetable: more than half a day, so not a connection we count.