BA 371 then BA 285 at Heathrow
Toulouse → London → San Francisco
Timetable, London time
13:15BA 371 from Toulouse at the gate
11:45BA 285 to San Francisco leaves the gate
22 h 30 apart on the timetable, overnight
BA 285 leaves 22 h 30 after BA 371 arrives on the timetable: more than half a day, so not a connection we count.