If possible, you ought to allow three-5h of transit time in Johannesburg, so that you've got ample time and energy to capture your connecting flight. Transiting in Johannesburg is quite easy; simply Adhere to the symptoms for ‘International Transit’. The flight from Johannesburg to Harare takes about 1h 30m. Streets https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/