I charge 75€/hour of proofreading, not by word count.
It takes approximately 3 hrs to proofread a doctoral thesis for example, and often a manuscript will take around 1 hr. Contact me and we can discuss about how much time depending on the length and complexity of your document.
Additionally, some have expressed that they would want me to improve the writing in their documents. If you would like me to work further with the writing style of your document, that can be discussed. I would be happy to do it, and work together with you to improve the writing, though I consider this outside the realm of usual proofreading corrections. I will not change the overall style of your sentences unless we have discussed otherwise.