I did this scenically beautiful bus trip with great company of Steve,who does a lot of his trips hiking. So we swapped a lot of tales from our travels and watched the changes from the high altitudes of Chile and the NW corner of Argentina down to the much lower city of Salta at 2400 metres. It took 12 hours and we arrived at 10 pm and took a lift to a hostel from hell. Steve got up three times during the night to tell off noisy younger people and was so pissed off, that when he left the next day he would only pay half the rate! Love the ballsy people from 'down under'