How long is a piece of string? Most editors will ask for a sample of your work in order to assess the type of editing needed. They will also ask you what you need in order to clarify your expectations of the editing process. Copy-editing a text that needs only a light edit can be completed more quickly than copy-editing text that needs to be restructured or that contains many errors in punctuation or grammar. Editors also work at different paces, so what might take one editor an hour could take another editor 90 minutes, for example. Also, if you want the editor to review your work again after you have responded to the initial edit, you will need to plan extra time for this.