March 7, 2014
August 14, 2015
August 15, 2015
August 18, 2015
Though I am not a Chinese tutor(and this is Korean forum), I will answer this question,
Chinese language has numerous characters to memorize, and it takes quite a long time to really master the language,
but I have seen some Chinese learners who learned how to 'speak' intermediate level of Chinese in a year.
However, it is like Robert said, it is really about how much exposure you get when you are learning the language, so there is no exact duration I can give you.
But, Good Luck!