The leaner you become, the longer it takes to lose fat healthily (the v Keto 6x key, as you want to preserve as much muscle and strength as possible while losing fat). If you're at 25% body fat, it's very possible to lose 2-3 pounds of fat per week for the first several weeks. If you're at 10% body fat and are making a run for single digits, however, 2-3 pounds of fat per week would be impossible without dangerous drugs.
https://fitose.com/keto-6x/
https://fitose.com/keto-6x/