SA 578 then SA 363 at Johannesburg
Durban → Johannesburg → Cape Town
Timetable, Johannesburg time
19:50SA 578 from Durban at the gate
19:00SA 363 to Cape Town leaves the gate
23 h 10 apart on the timetable, overnight
SA 363 leaves 23 h 10 after SA 578 arrives on the timetable: more than half a day, so not a connection we count.