Originally Posted by tgsh2006

You will need to book the EK limo at least 48 hours in advance, so you will need to know were you are going to be getting it from. 6 hours is a little too short to do anything decent in JNB; considering you'd need to get back to clear security, immigration (which can be busy) etc. If you wanted a decent meal you could take the new Gautrain to Sandton and eat out at Sandton City or Nelson Madela Square. You could book a private tour via taxi to get an overview of JNB CBD. Other attractions (such as the Apartheid museum) would require more time.