Am I being unrealistic with drug addict?

So my husband has been addicted to pain pills for a while. I am sick of it and have given him an ultimatum. I told him he has to be off of them and not taking any in a month. So if he has been taking 10 pills a day, is it feasible for him to be clean in a month? He saying that I’m being unrealistic! I kinda feel like he may be just feeding me full of crap. At first he agreed to it in the heat of the moment when I told him I was leaving if he didn’t get clean. Now, he tells me I’m being unrealistic. Please tell me your thoughts.

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