here have been published many articles lately about the quantity of time someone should talk a language – or more than one – per day. Probably the number 20% sounds familiar? The amount of exposure per day or week depends on your goal: do you want your child to be perfectly fluent or would it be enogh for him to understand a conversation?
Laura-Ann Petitto points out that “systematical exposure is more important than the amount of time of the exposure. The human brain doesn’t work on quantity but on quality. Therefor, regular systematic exposure “with stable users across different contexts which are rich and varied” will help a child to reach fluency. This means that immersion exposure at school only is not enough to become utterly fluent. It has to be enriched by “cultural material, linguistic material, movies etc” also outside the schoolday.