SA 558 then SA 347 at Johannesburg
Durban → Johannesburg → Cape Town
Timetable, Johannesburg time
15:50SA 558 from Durban at the gate
15:15SA 347 to Cape Town leaves the gate
23 h 25 apart on the timetable, overnight
SA 347 leaves 23 h 25 after SA 558 arrives on the timetable: more than half a day, so not a connection we count.