We require everyone to be in Cusco for at least 2 nights prior to starting the trek, although 3 nights is even better. You must pay your trek balance at least 2 days before trek departure. For example if your trek departs on a Monday you must come to our office before 7.30 pm on Saturday to pay the trek balance. This ensures that everyone in the group is well acclimatized to the high altitude before starting the trek. Please note the trek balance needs to be paid in Cusco and cannot be paid in advance of your arrival.