English text editing

I just received a business analysis from a friend of mine. The point is that he is not a native english speaker and although the analysis results are of high standard, the explanation is not as good as it can be.

I do not have the time to edit it, so I am looking for a native english speaker to edit the text. It is about 50 pages, 1.5 indentation.

Please mention time of completion and the fee.