UA 188 then SA 359 at Johannesburg
Newark → Johannesburg → Cape Town
Timetable, Johannesburg time
18:35UA 188 from Newark at the gate
17:30SA 359 to Cape Town leaves the gate
22 h 55 apart on the timetable, overnight
SA 359 leaves 22 h 55 after UA 188 arrives on the timetable: more than half a day, so not a connection we count.