This is a good question, but honestly hard for me to answer. Mainly because I personally haven't dealt with that with my spouse. My husband doesn't even drink alcohol! Not even a little bit! Now that I am thinking about it, I did deal with it from a daughters perspective. My mother and stepfather were married 10-11 years before he started using drugs. I think the drugs led to cheating and that is what ultimately broke them up (besides the fact they knew seemed to be really IN LOVE, now that I know what being IN LOVE is). I have really never talked about it to my mom about what was the ultimate reason, but I know soon after I found out about the drugs, he was out of there. This subject is hard because I could say all day I would leave him! But being in that situation is another story.
I think you have to ask yourself many questions: "Do I really love my husband enough to stay with him through this addiction?" "Am I willing to help him get over this problem?" "How will it affect my children?" "How will I help them deal with this?" "Is this an addiction that will take days, months, years to get over?" "Will his addiction financially ruin this household?" "Can we recover?" "Is this worth it?" "Can I trust God to deliver my spouse?" "If he relapses, can I handle starting over helping him again?" I really can't put a time stamp on this question. The answer is more about what's in the heart of the WIFE (or hubby) whose dealing with a spouse that is struggling with an addiction. In your heart or gut, you know your limits and how much you can take. I do hope some women out there who read this, really comment and give you a better answer. God Bless you.