If Possible, you need to let 3-5h of transit time in Johannesburg, so you have ample time for you to capture your connecting flight. Transiting in Johannesburg is very straightforward; basically Stick to the indications for ‘Worldwide Transit’. The flight from Johannesburg to Harare usually takes about 1h 30m. If https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/