SA 556 then 4Z 789 at Johannesburg
Durban → Johannesburg → Port Elizabeth
Timetable, Johannesburg time
14:10SA 556 from Durban at the gate
13:204Z 789 to Port Elizabeth leaves the gate
23 h 10 apart on the timetable, overnight
4Z 789 leaves 23 h 10 after SA 556 arrives on the timetable: more than half a day, so not a connection we count.