How many times a day do you have to use Cocaine to lose weight?

My boyfriend has been losing a lot of weight and I know he has been using cocaine to do so. I was wondering how many times a day he would be using it to do so, and when. I am trying to figure out how much money he has wasted, and the times he is doing it so that I can bust him.

He is getting help soon.
An intervention is being planned, that is why I need to know the answers to these questions.