But is a 3-4 hours per day for 4-5 days per week true immersion? And is it enough to master a complex language such as Mandarin Chinese? I suspect that, using

But is a 3-4 hours per day for 4-5 days per week true immersion? And is it enough to master a complex language such as Mandarin Chinese? I suspect that, using this model with Chinese, a child can become conversationally proficient and gain some basic reading comprehension. Whereas, with a more simple language, they may be able to read, write, and speak on the same level as a native-speaker. Looking for evidence to prove me wrong.