By my example, I can say that I lost 19 kilograms in half a year. 95 ---> 76. Just a calorie deficit (2000 ---> 1700) plus daily exercise.
the question, in fact, is ambiguous: it all depends on your starting weight - is there a difference between 50 and 150 kg?
and, of course, the timing of your weight loss. everyone has known for a long time that a sharp weight loss does not lead to anything good, except for malfunctions in the body. proper nutrition, regular exercise, a lot of movement and a positive attitude are the key to a successful transformation.
Well, if you need it urgently, then ... do not eat anything, that's absolutely, occasionally allowing yourself to bite off an apple or drink a glass of skim milk. and then suffer with stretch marks, sagging folds and other delights of a "happy and slim" life.
It depends in what ways you will do it and what is the% of excess body fat.
Let's say that now you weigh 60 kg with a height of 170 and want to lose weight to 40, because this BMI weight is "normal", then you will lose weight long enough on PP and sports - three or four months.
But if your weight fluctuates around 100 with a height of 160 and recently you have not been involved in sports, or followed the rules of healthy eating and calorie intake 1000-1200, then with a sharp transition to PP and sports, you can quickly throw everything off ...
Also, do not forget about killing express diets, like drinking or strict calorie intake of 200-500 kcal per day. Here, of course, you will die and barely move, but the weight will go off very, very quickly and the main thing is to keep this weight after such abuse of the body.