First of all, it usually takes about 10-20 days to make your body get used to the fasting pattern.
You might begin to first notice a difference in your body about 10 days after you begin intermittent fasting. The weight loss results vary as people have different physical and mental situations.
A healthy sustainable weight loss is around 1~2 pounds (0.5-1 kg) per week. It could take 2-10 weeks for different people to lose a significant amount of weight.
Do not pay attention to the number on the scale only, there are many factors that are improved through fasting, such as waist circumference, clothing size, muscle mass, fat mass, appetite, how you feel about your body, sleep quality, etc.