ZN 307 then SA 355 at Johannesburg
Lusaka → Johannesburg → Cape Town
Timetable, Johannesburg time
18:30ZN 307 from Lusaka at the gate
16:40SA 355 to Cape Town leaves the gate
22 h 10 apart on the timetable, overnight
SA 355 leaves 22 h 10 after ZN 307 arrives on the timetable: more than half a day, so not a connection we count.