I've got my MS with a publisher who wants 6 months exclusive rights to review my work. Has anybody ever said OK and yet sent it elsewhere anyway?
6 months seems a little long to me-- I want to see some progress that I can report to my "superiors"....
thoughts?
This does, indeed, sound like a very long time. On the other hand, before a press commits to sending a manuscript out for review (which involves paying a reading fee to, usually, two people) it does generally want an assurance that it can have the book if it wants it. I've known of presses that asked friends of mine for exclusive rights for times between six weeks and three months.
Generally, however, sending the manuscript elsewhere when you've promised exclusive rights for x time to one press is dishonest, and academic publishing is a very small world. You are quite apt to acquire a nasty reputation and find that you're not welcome anywhere. What happens, for example, when press A sends your manuscript to the best reader for a book in that subfield, and you send the manuscript to press B, and press B asks the same best reader to read it? Usually, the reader (who has good relations with both presses) will tell Press B that s/he's already reading it for Press A, and may well tell press A about it. (If the reader doesn't, the editor at press B, who is very annoyed with you, will call his/her good friend, the editor at Press A, and provide the information.) Result = neither of them will go further with the manuscript, since you're seen as "not dependable" or "not trustworthy."
The ONE exception I know when it's OK to refuse any exclusive reading at all, and make multiple manuscript submissions, telling presses that you are doing so, is when you have a truly exciting manuscript on a very hot new and/or current topic, and press editors will all realize that. I think an academic book of this nature comes along about once every two or three years.