How Many Acknowledgements Should An Author Include In A Book?

guardian.co.uk:

Acknowledgements are one of the few places in a book when a writer can break out of their fictional world and address readers in their own voice. This is something that perhaps is more powerful than we realise. While I know the text is supposed to be the most important thing, and I'm well aware that the biographical details of a writer's life should be incidental to the reading experience, the acknowledgement pages can have a subtle effect on the way I read a book.

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