As a fitness and health expert, I can tell you that the time it takes to lose 20 pounds by walking can vary greatly depending on several factors, including your current weight, diet, walking intensity, and individual metabolism.

To lose one pound, you generally need to burn about 3,500 calories. Walking can burn anywhere from 150 to 300 calories per hour, depending on your weight and speed. Let's assume an average of 225 calories burned per hour of walking.

To lose 20 pounds, you would need to burn 70,000 calories (20 pounds x 3,500 calories/pound). If you walk for one hour a day, it would take you approximately 311 days to lose 20 pounds (70,000 calories / 225 calories/hour).

However, this is a simplified calculation and doesn't take into account the fact that as you lose weight, you'll burn fewer calories during the same activity. Additionally, incorporating a healthy diet is crucial to losing weight effectively.

Remember, it's important to consult with a healthcare professional before starting any weight loss program to ensure it's safe and suitable for your individual needs.

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Walking at a pace of 3.5 miles per hour for 30 minutes, a 155-pound person can burn about 149 calories, or 298 calories in one hour. Over the course of 60 days this is 17,880 calories, or just over 5 pounds. You are going to have to increase that intensity, and make dietary changes, to lose 20 pounds in two months.read more >>