My own experience I got my 1st + opk on Thursday the 16th at 10:30p. It was positive all day yesterday the 17th and positive this morning the 18th. Im expecting it to be back to a negitive tonight around 10:30p. So really it's different for each person. Anywhere from 12-48hrs. Good luck!
I think it doesn't matter how long your opk's stay positive, my doctor used say: "stop testing as soon as you get positive, it doesn't matter how long it stays positive..."
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