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The distance matters more than the time. If you want to break it down very easily (I'm risking a lot of flames by the other GFY doctors here) it's a simple distance * body weight = calories equation, and 3500 calories = 1 lb of fat. If you can burn 3500 more calories than you eat a week, you'll lose 1 lb of fat. Even with all the miracle diets and books and workout programs etc, this is a basic rule which works.
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