Preferably, you'll want to make it possible for 3-5h of transit time in Johannesburg, so that you've got ample time and energy to capture your connecting flight. Transiting in Johannesburg is rather easy; only Stick to the signs for ‘International Transit’. The flight from Johannesburg to Harare can take about https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/