BA 949 then UA 925 at Heathrow
Munich → London → Washington
Timetable, London time
17:00BA 949 from Munich at the gate
16:20UA 925 to Washington leaves the gate
23 h 20 apart on the timetable, overnight
UA 925 leaves 23 h 20 after BA 949 arrives on the timetable: more than half a day, so not a connection we count.