Depending on your country of origin, you will be exempt or not from the need for a tourist visa to travel to Argentina. Whether you need it or not, the maximum period allowed is 90 days, with the possibility of extending another 90 days, that is, a total of 180. You have all the information in: «Tips, documentation and requirements to travel to Argentina«.
You have all the information in: "Tips, documentation and requirements to travel to Argentina".