If Possible, you must allow 3-5h of transit time in Johannesburg, so that you've got ample time for you to capture your connecting flight. Transiting in Johannesburg is rather effortless; simply Keep to the signals for ‘Worldwide Transit’. The flight from Johannesburg to Harare can take about 1h 30m. Off-peak https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/