As a fitness expert with a deep understanding of exercise physiology, I can provide you with a detailed answer to your question. The time it takes to burn 1000 calories on a treadmill depends on several factors including your body weight, the speed at which you're running, and the incline setting.

To give you a general idea, here's a rough estimate based on a person weighing 150 pounds (68 kg):

- Walking at a moderate pace of 3 miles per hour (mph) might burn around 300 calories in an hour.
- Running at a pace of 5 mph could burn approximately 500 to 600 calories in an hour.
- Running faster at 6 mph could burn around 700 to 800 calories in an hour.

Using these estimates, you can calculate the approximate time it would take to burn 1000 calories:

- For walking: It would take roughly 3.3 hours (1000 / 300).
- For running at 5 mph: It would take about 1.7 to 2 hours (1000 / 500 to 1000 / 600).
- For running at 6 mph: It would take around 1.25 to 1.4 hours (1000 / 700 to 1000 / 800).

Keep in mind that these are very rough estimates and the actual calorie burn can vary based on the individual's metabolic rate, fitness level, and other factors. Additionally, increasing the incline can significantly increase the number of calories burned.

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Interval training burns calories faster due to the high burst of intensity. A walk that usually takes 60 minutes may only take 45 minutes with small bursts of high-intensity walking. Depending on the exercise, interval training can burn 1,000 calories in 60 to 90 minutes.read more >>