BA 212 then BA 870 at Heathrow
Boston → London → Budapest
Timetable, London time
06:15BA 212 from Boston at the gate
19:45BA 870 to Budapest leaves the gate
13 h 30 apart on the timetable
BA 870 leaves 13 h 30 after BA 212 arrives on the timetable: more than half a day, so not a connection we count.