How much time will it take to run 3 miles for a beginner every day??

actually, i am not so good at sports..so i have decided to loose my weight by running 3 miles per day.........how much time will it take ????? i am14 years old and my weight is 53 kgs or about 117 lbs......i dont run so fast......and also i am not allowed to move over 40 feet from my house...(as i am doing it in the night)..so i will have to run and then turn back again....soo how shall i do it???? will i loose weight by that????i wanna lose 5-6 kgs and tone up my body???? soo in how much time will i be able to do that?????