The entire license convertion can take a good 6-9 months. Currently on the 8th month window (FAA ATP)....still need to take the check-ride. They will not accept your hours flown, which means:
Last time AR Called for pilots: They required to have at least 900 TT and Comercial 1st class License.
LANAR They required 900TT and 25 MultiEngine.
And since ANAC will not accept hours flown anywhere but Argentina, you will not meet the minimum requirement, even if you have an ATP which will surpase those requirements...along with citizenship, Radio Operador Restringido...etc.
Anyway, like cosmic said, there will not be any hiring in the near future, LANAR still struggling with the local government trying to kick them out of the country and AR trying to find a good management team and not some knukle heads (La Campora) trying to manage an airline with ZERO industry experience....baffles me, but is true.
Good luck.