Hi. I´m American, a native English speaker, living in Brazil. I do lots of proofreading and editing, mainly for university students and post-graduates who need help with the final adjustments for publishing their academic work for an English-speaking public. I can correct and revise your text of 28 pages in 5 days or less, depending on my familiarity with the subject matter and technical terminology. I provide corrections of grammar, spelling, typing errors, punctuation, flow of ideas, general readability and clarity of communication. I´m not sure what you mean by "iterations", but if you are asking how many times you can review my corrections (I use Track Changes) and ask for further corrections or alterations, once is usually enough, although I can allow it twice if needed. Please contact me for a perfect English version of your manuscript.