Spent 8 months trying to validate my EASA license in Brazil...
All I got is a "no no" from the ANAC. No explanations and no descent way to contact them in order to get a feedback.
It is indeed a very long process. Lots of paperwork and lots of delays from the ANAC, quite difficult to get reliable information too.
I did this in 2013, in Minas Gerais. The only advice I could give you is to do it somewhere else. As alemaobaiano said, it seems some ANAC offices are more helpful than others.
I'll definitely be interested to know how it goes, so keep us posted.
You can PM me too if you have more specific questions.