SA 556 then FA 121 at Johannesburg
Durban → Johannesburg → Cape Town
Timetable, Johannesburg time
14:20SA 556 from Durban at the gate
13:25FA 121 to Cape Town leaves the gate
23 h 05 apart on the timetable, overnight
FA 121 leaves 23 h 05 after SA 556 arrives on the timetable: more than half a day, so not a connection we count.