Another point in the link 7 Mistakes to Avoid When Writing Fiction I'd like to comment on is this one:
So, you can write a 1000 page book? You can. Sure. But, should you? Being wordy gives you a surefire shot at rejection. It is not about showing off your English vocabulary. It is about using only those words that the story needs.. Read your script; see if the book actually requires those 1000 pages of material. In most probability, you would have only 600 pages of the essential story and the rest of unnecessary words hanging here and there!
Rationalize. Remember an unedited story is an agony for readers. They are reading till the end of your story just to know what happens in the end. So make each section of your story an acceptable experience for the readers. As a writer, ensure you don’t go the routine way of information over feed. The audience wants to be entertained and not instructed and jaded. Make sure you send out your crispest version to literary agents and publishers. Nobody has the time.
This came up at the writing session I attended last Saturday when one of the women conducting the session saw how thick the manuscript of my memoir is. She says something of that length would result in immediate rejection. Though FYI, it is only 321 typed pages. If I was told to type 1000 pages, I'd be panicking! One of the things I dreaded about having to write papers in school was the length dictated and/or the number of words the instructor indicated. Even today, when I can write about whatever I want, the idea of typing 1000 pages seems daunting. It seemed difficult enough to get over 100 pages, let alone 300 or more.
NowNovel says the following about manuscript editing:
Now I'm not sure how this would apply to editing a memoir, though I'm sure even those require some editing and cutting as far as the length of the manuscript goes.
Cutting Words Isn’t so Hard. No, Really
When is a manuscript “too long”?
Step One: Decide how much you want to cut
Step Two: Decide Where it Needs the Cutting
Step Three: Cut down the manuscript
Tricks to make manuscript editing and cutting words easier
And right now, I'm trying to decide what to do with the diary novel in terms of the length. Some have said it's long enough for a kids' books. It's currently 100 typed pages. Not a a lot to cut out.