BA 669 then VS 354 at Heathrow
Marrakesh → London → Mumbai
Timetable, London time
20:45BA 669 from Marrakesh at the gate
18:15VS 354 to Mumbai leaves the gate
21 h 30 apart on the timetable, overnight
VS 354 leaves 21 h 30 after BA 669 arrives on the timetable: more than half a day, so not a connection we count.