This is a repost from 2009:
I heard somewhere that if you do something, anything, for 10,000 hours you gain mastery of it. It doesn’t matter what it is.
But you gotta do it. You can’t fake do it. So, if it’s learning Lakota, you can’t do worksheets and study a book that talks about the Lakota language (doesn’t that sound funny?) . You listen to somebody who knows Lakota. After 10,000 hours, if the supposed axiom is true, you speak Lakota.
That ties in with the way Krashen is saying, pretty much irrefutably, that, if you read a lot, you get really good at it. The benefits accrue in direct relationship to the time spent doing it. Any other teaching, instruction, reading tips, pedagogical hijinks in the reading classroom amount to very, very little.