fentanyl addiction

Can anyone tell me how long it takes to become dependant on fentanyl? I have ten 50 mcg/h patches and I am told to wear each patch for 3 days, therefor to last me one month. I am concerned that after a month's use of these patches, I will be hooked on them. If anyone knows how long it takes to create an addiction to fentanyl, can you please tell me? Thank-you
 
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