The website of the Brazilian Consulate in Los Angeles states that it takes "at least 5 business days" to get a tourist visa. A visa agency/service isn't going to have any influence on that. If the Consulate folks aren't dealing with a pre-WC rush (similar to what happens before Carnaval), maybe they can process your visa in that minimum time. They may be able to assure you of that if you go in person and talk to them. If you can't do it any sooner because of other trips, you'll just have to take your chances, won't you? Most Br. Consulate sites say not to purchase tickets until you have a visa, though.