VS 6 then BA 870 at Heathrow
Miami → London → Budapest
Timetable, London time
06:30VS 6 from Miami at the gate
19:25BA 870 to Budapest leaves the gate
12 h 55 apart on the timetable
BA 870 leaves 12 h 55 after VS 6 arrives on the timetable: more than half a day, so not a connection we count.