The amount of time it takes to lose 20kg of fat will depend on several factors, including your starting weight, your diet and exercise habits, and your overall health and metabolism. However, as a general guideline, a safe and sustainable rate of weight loss is about 0.5 to 1kg per week. Based on this rate of weight loss, it could take anywhere from 20 to 40 weeks, or about 5 to 10 months, to lose 20kg of fat.


It's important to note that weight loss is not just about reducing fat, but also about losing muscle mass and water weight. To lose fat while preserving muscle mass, it's important to follow a balanced and nutritious diet that provides adequate protein, along with a regular exercise routine that includes both strength training and cardio.


It's also important to consult with a healthcare professional before starting any weight loss program, particularly if you have any underlying health conditions or if you are taking any medications. They can provide guidance on a safe and effective weight loss plan that is tailored to your individual needs and goals.