How much weight can i lose jogging a mile a day and eating 150-200 calories a day?

I know, people are going to say im starving myself. I'm NOT. I have a bowl of oat bran a day (it's VERY filling) and a cup of coffee. I also jog a lot and drink 0 calorie healthy drinks. I feel great, so i'm not getting sick from lack of food or anything. I want to lose around twenty pounds. how long will it take doing what i'm doing? thanks!