My rates correspond with what the Editorial Freelancers Association (EFA) recommends professional copyeditors charge for basic editing work. The rate is generally higher for heavy and developmental editing. As a member of the EFA, I have access many useful recommended parameters.
Also in alignment with the EFA's guidelines, I can copyedit 6-10 manuscript pages per hour—a manuscript page is 250 words. This is the simplest and most accurate approach to estimating how long it will take to edit your work since it also takes into account the level of technical complexity of your work. Once I have edited your sample, I can give you a closer estimate of how many pages I can edit in one hour.
www.bockediting.com