This is a little deceptive though. You can acheive some proficiency in Norwegian in such a short time, but since it's a partial tonal language, your accent will give you away immediately.
Thats not really the point of learning a language though is it? To have no accent at all? Not even native speakers can speak without an accent. Theres always going to be regional variation. The only standard one should have in language is being able to effortlessly have a conversation, and you can have plenty of conversations with an accent.
That is hardly a problem. People thinking they can do it on a learn-Norwegian-in-5-minutes-a-day is a real problem.