I know some people that were pretty fluent in Korean after 18 months. Spanish is easier to learn than Korean, so I'd say yea.
I think the fastest way is to go over the lessons that are on Youtube, watch TV, and go in the Spanish chat on Yahoo. I used to do that. I'm probably about 60-70% fluent, but I read better than I can "listen". So many languages floating around in there, that I get the words mixed sometimes.