Thanks for your question! The guided Mala walk is 2km and starts at 8:00am in December to avoid the heat. The base walk is 10km, however you can just do portions of the walk if you do not have as much time. We do not recommend walking in Uluru during the hot seasons after 11:00am - do ensure that you are equipped with a hat, plenty of water, sunscreen, and clothing to cover as much of your skin as possible.