BA 252 then BA 668 at Heathrow
Grand Cayman → London → Marrakesh
Timetable, London time
11:15BA 252 from Grand Cayman at the gate
07:35BA 668 to Marrakesh leaves the gate
20 h 20 apart on the timetable, overnight
BA 668 leaves 20 h 20 after BA 252 arrives on the timetable: more than half a day, so not a connection we count.