The length of time to achieve crop mastery depends on the crop, maturity date and how much time you are willing to invest into Farmville. You do have to be at Level 10 minimum to participate, but that is not too difficult. You will see stars underneath the crops in the market.
Therefore, you will get one crop mastery point per plot you harvest, for each crop. The crops all require different points to master each level. Usually, crops that take a longer time to grow will have lower mastery point requirements.
There is a smaller gap for points between 0 to 1 star and 1 star to 2 stars. However, there is a drastic difference between 2 stars and 3 stars. This is a smart ploy; people will generally try harder for that last one.
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