Hello! What better for Google long url or short url? For example: What better www.blabla.com/product.html or www.blabla.com/products/productname/features.html?
Erm, It usually depends. Personally the long name gives more of description, so you can describe the product more. One the other hand a short URL is easier to remember. To be honest I don't think Google cares.
Think about your visitors too, not only for search engines. Visitors are the ones who need to be convinced to came back to your website. As the others already wrote, this is a marketing problem, not a search engines one.
I don't think Google has a specific limit...but they do look for "spammy" things...like to many hyphens (I suggest 3 max in any url). Don't use a URL structure to stuff keywords either...rather think about logical grouping. This is better for your visitors...and works to your advantage with search engines like Google. blabla.com/product.html......is better. blabla.com/product-category/product.html......is best. Ideally...create a product category index page as well... blabla.com/product-category/index.html......put a product category description on it...and link to each of your product pages within this category. Link each of your product pages back to this index page...after all, these products do belong to this category...this creates a "central hub" for your product category. Think about it...you now have simplicity,consistency and all the keywords you need in your url. I promise, the whole is larger than the sum of its part in this scenario.