drdawggy on Jul 16, 08 at 10:00 AM. I would say 365 days in Buenos Aires would be about right....but since you only have 12 days.... if I were you...I would spend a couple of days (3 days/nights or 4/3) taking in some of the natural wonders of Argentina--Iguazu Falls, Patagonia,the Northwest, or Mendoza's wine country.Report Abuse.A was one of my least favourite cities so I would give it 3 days but a lot of people love it so 4-5 days seems reasonable. If you like cities then I guess you could go to Santiago but I would suggest going to El Calafate and see some glaciers or go up north to Iguassu to see the falls.