4Z 221 then UM 468 at Johannesburg
Tete → Johannesburg → Harare
Timetable, Johannesburg time
15:354Z 221 from Tete at the gate
14:00UM 468 to Harare leaves the gate
22 h 25 apart on the timetable, overnight
UM 468 leaves 22 h 25 after 4Z 221 arrives on the timetable: more than half a day, so not a connection we count.