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You should keep it brief as possible. Too long url's wont add anything. The URL can be a signal on what your topic or page is about. But i shoud'nt stress that too much. If you take wordpress for example when writing a new page, blogpost or so, it usually takes the page title and cuts it up with /something-as-a-title/ I am experimenting with shorter url's too in comparison to the page title. I dont see any gain nor disadvantages on it.