Ideally, you need to allow three-5h of transit time in Johannesburg, so that you've enough time for you to catch your connecting flight. Transiting in Johannesburg is very effortless; simply just Stick to the signals for ‘Worldwide Transit’. The flight from Johannesburg to Harare takes about 1h 30m. In the https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/