I have 718 trans union credit score and wondering how long will it take to be a good credit .?

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Some people says good credit starts from 751 to 780 score . I would also like to know what is the difference between fico score to trans union credit scores . Please could you also tell me if credit score changes every day or on monthly .

I have 718 trans union credit score and wondering how long will it take to be a good credit .?