So asks Tommo Valkonen in the latest Memrise Blog. You might find it interesting. There is an associated Youtube video, which I haven’t yet watched.
http://www.memrise.com/blog/can-you-learn-a-new-language-in-5-weeks/
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In a word, no.
I think it depends on how you define ‘learning a language’ and then what you do, and how much of it… 