I think it depends on where you are and how you get to where you want to go.
If you are very obese, you will loose rapidly and as you get closer to your ideal weight, body fat loss will become slower and harder.
Also, it depends if you over eat or under eat, or if you over train or under train. Or if you are male or female or old or young. Hormonal issues can also affect things. Lots of variables to consider make it difficult to answer your question.