It depends on the word limit you choose, 100 nope, 200 nope, 300 nope, 400 nope, 500 nope, 600 yep.

You don't want your book to be a story do you?

You don't want your book to be read in a minute do you?

The limit in a cover contest should be equal to........uhhhh..... 140 or 150 because covers should be explained well at the most 52. Or you can go a little below it.

In short quiz or horoscopes, keep it small so that people could scroll and read all of it.

UNDERSTAND???????????????

If you're writing  a sequel, 15 chapters would be enough, plenty.