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So I would like a few opinions. How long should a product description be? Enough to get the point across? 100 words? 800 words? Over detailed? Any advice would be appreciated.

Hello, I sell products relating to wood. Although the products vary, I like to give description of the wood type for the customers who might not be familiar with it. Will it hurt my rankings to give the same descriptions for the same wood type as long as the majority of the description is different? Here is an example of the layout: 1. Different description for different products 2. The same short description for the same wood types (seen throughout multiple pages) Hopefully my question makes sense.