I was wondering how long it takes other poeple to go into opiate withdrawal. I have read that it takes about 12-24 hours to start the early withdrawals from herion. Myself it takes a bit longer than 24 hours to show any withdrawal signs at all. It has been 24 hours since my last shot and I am at work and i just feel a little cold that its. My habit has gone way down lately. Could it be that I am not addicted that bad. Whats the deal?