Originally Posted by
Herb687
Many round trip fares have a 30 day maximum stay restriction.
There are many different limits that may exist on fares, 30 days being one of them; assuming that the OP purchases one which permits stay of 1 year, then will not be an issue
Looking at fares to EZE ( from PDX ) , none has anything less than a 1 year validity for maximum stay though many have minimum stay requirements