Nation (2014) (pdf) discusses English vocabulary acquisition through extensive reading alone. While reading at a 98% comprehensible input level, the learner will (probably) remember a word encountered 12+ times:
In this study, the moderately safe goal of 12 repetitions is taken as the minimum. ... enough to allow the opportunity for several dictionary look-ups, several unassisted retrievals, and an opportunity to meet each word in a wide variety of contexts.
However, I'm learning Mandarin Chinese, so I'm wondering if there is similar research in this direction. Reading in Chinese is rather different to reading in English.
Question: For Mandarin, are there estimates on how many repetitions it takes to remember a word through reading?