Ideally, You ought to permit three-5h of transit time in Johannesburg, so that you've got ample time to catch your connecting flight. Transiting in Johannesburg is very straightforward; simply just Keep to the signs for ‘Global Transit’. The flight from Johannesburg to Harare requires about 1h 30m. Nationwide Artwork Gallery: https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/