Can you be more specific, or include screenshots?
I have several files (70-80) in a book and have published HTML output for the book.
However, I just now want to update a single file in book and somehow replace the HTML for that particular file in the previously created output. (instead of publishing the book again!).
Just replacing the .htm for the file in the output folder, I lose the formatting etc.
If you need to fix a typo, or lightly edit text, you should be able to edit the HTML with a text editor, but I'd be inclined to fix in Fm and republish. HTML isn't the most friendly editing environment.
How long did the initial publish take?
Yep, ok. It took around 15-20 minutes.