If you stuck to that regime, I'd say about a month or two. Being more realistic though, if you lose a pound per week, then you are doing a good job. When losing weight, you expect it to be slow and steady - not much fun at all.
not long
1 year
4 miles.
7
1200 Calories
1,500 calories a day
You need to lose 10 lbs at 3500 calories a pound.
zero
You can lose 120 calories depending on how fast you walk. I'm 15 and weigh 95 pounds so I would lose less :P. GOOD LUCK!
About 1500 calories
To lose a pound, no matter what weight you are, you need to burn 3500 calories.
It depends on how much you weigh, and how many calories are in your body in the first place.
You could only eat about 2100 calories a day.