4Z 556 then SA 355 at Johannesburg
Durban → Johannesburg → Cape Town
Timetable, Johannesburg time
18:104Z 556 from Durban at the gate
16:40SA 355 to Cape Town leaves the gate
22 h 30 apart on the timetable, overnight
SA 355 leaves 22 h 30 after 4Z 556 arrives on the timetable: more than half a day, so not a connection we count.