UA 920 then BA 370 at Heathrow
Chicago → London → Toulouse
Timetable, London time
07:55UA 920 from Chicago at the gate
07:00BA 370 to Toulouse leaves the gate
23 h 05 apart on the timetable, overnight
BA 370 leaves 23 h 05 after UA 920 arrives on the timetable: more than half a day, so not a connection we count.