EW 2604 then BA 507 at Lisbon
Stuttgart → Lisbon → London Heathrow
Timetable, Lisbon time
17:55EW 2604 from Stuttgart at the gate
15:50BA 507 to London Heathrow leaves the gate
21 h 55 apart on the timetable, overnight
BA 507 leaves 21 h 55 after EW 2604 arrives on the timetable: more than half a day, so not a connection we count.