BA 371 then BA 213 at Heathrow
Toulouse → London → Boston
Timetable, London time
12:05BA 371 from Toulouse at the gate
11:40BA 213 to Boston leaves the gate
23 h 35 apart on the timetable, overnight
BA 213 leaves 23 h 35 after BA 371 arrives on the timetable: more than half a day, so not a connection we count.