>>/33136/
> Since this is the emigration thread, how much time could I live with $300 Reais, brazilbernd?
Not for long, that's less than a third of the minimum wage. To make matters worse Florianópolis has one of the highest living costs among state capitals. See http://www.custodevida.com.br/sc/florianopolis/ for some reference costs. As of November the cesta básica was R$ 478,68 (see https://www.dieese.org.br/cesta/produto), and that's just for food and assuming you have the means to cook it. If you lowered your living standards you'd survive, but don't don't expect to last long with that.
> Hopefully I get a pedreiro job as well.
The more experienced ones are better paid than one would expect but before becoming one you must first work as a servente de pedreiro. Which is not bad, it's simple work and the pay is better than trying to survive on R$ 300 of spare money. I don't know how easy it'd be to get the job in the first place, though.
Are you really that desperate? Argentina's future prospects aren't all that good but as it is your plan is much riskier than just living through its decline.