I just worked on a project with the Association of Psychological Type, where I converted something from a Word document based template to InDesign. The slight difference would be the chapters and whatnot, but its otherwise a similar project.
Depending on the complexity of the design, it might take anywhere from 10 - 30 hours. For example, if the book is a fiction book with no custom graphics, nor anything beyond mostly laying text on a page, then it will be much quicker. However, if there are annotations, custom graphics, various types of charts/text boxes, etc., then it could take longer depending on how many of these other variables are introduced.
I would like to explore developing your book into something that is CreateSpace compatible. Thank you for your time, I hope to hear from you soon.