Ideally, You need to allow 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 quick; basically follow the indications for ‘International Transit’. The flight from Johannesburg to Harare can take about 1h 30m. When https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/