Heroin how long for withdrawals?

I've been using since Monday,once a day...today I used once but I want to use one more time in some minutes...cause It makes me warm and,I'm cringing from cold....
When should I stop to keep withdrawals away?

Now would be a good choice....Very few can use in moderation and I absolutely HATE the folks that can

There's no way for anybody to tell you for sure when your going to become physically dependent.. it is different for everyone but, basically, if you are using more than once or twice a week, you are going to pick up a dependency. With your history, I'm surprised you don't have on already, and I'd say it's going to be any day now.