Rational doubt ( doubt in rational number)

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If there is a prime number x, if we reciprocate it we will get 1/x.

Reciprocal of prime number will be a rational number , Except 1/2 and 1/5 , every number which is reciprocal of prime number is a recurring non terminating decimal number.

Question- How to find that after how many digit recurring numbers will repeat ? How to find the recurring numbers?