BA 669 then AT 801 at Heathrow
Marrakesh → London → Casablanca
Timetable, London time
19:50BA 669 from Marrakesh at the gate
17:10AT 801 to Casablanca leaves the gate
21 h 20 apart on the timetable, overnight
AT 801 leaves 21 h 20 after BA 669 arrives on the timetable: more than half a day, so not a connection we count.