Farm fresh vs Store Bought chicken?

We have a chicken to cook tonight that is from a friend's farm. My plan is to beer-can cook it (we have another that I will brine and roast another day).
I have been planning on about 1.5 hours for cooking time. However, the person we got the chicken from says it will take at least 4 hours because it is a farm raised chicken and not store bought (and injected etc).
I have never heard of it taking so long to cook a chicken, store or farm bought. Is he right?

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