how much content to rank a keyword

There is no standard estimation. You just start writing quality articles to attain desired ranking . Quality content plays vital role here :)
 
If your site with quality content. You can
get good ranking.
 
How does google measure the quality of a content?

Well many things come into play when google judges the quality. Such as the standard of the writing. Keyword density, quality of the media inside article, grammatical errors etc. Also if you have copied the content or not.
 
Google need a quality hand written content and keywords ,good ranking
 
huuuuge content will win. Like 2000 or more words. Google seems to be loving this in my fitness niche. Outranking many others without links
 
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