If possible, you'll want to allow for three-5h of transit time in Johannesburg, so that you've sufficient time and energy to catch your connecting flight. Transiting in Johannesburg is very quick; only follow the indicators for ‘International Transit’. The flight from Johannesburg to Harare requires about 1h 30m. National Art https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/