|WikiProject Linguistics / Applied Linguistics||(Rated Start-class)|
"This time often varies between learners, and depending on the author, estimates at its length vary from 12 hours of instruction to more than 6 months of language learning."
As far as I remember, the 12 hours of instruction claim is from James Asher's "Learning Another Language Through Actions", his book about Total Physical Response. The 6 months claim is a little more hazy in my recollection, though I think it's from something by Dr. J. Marvin Brown (see also this article which makes a 6-8 month claim). I haven't had time to dig through the sources yet. If someone else knows them, please add them here! — Mr. Stradivarius ♫ 04:57, 4 November 2010 (UTC)