Welcome to the group. Mobileread has a version of War and Peace available for download. Looked at its size and it's about 2 MB. So you could fit 1500 copies of War and Peace in your Kindle, or thereabouts.
If you look at the size of the downloads of books available for sale at Amazon, you'll see that the normal size of most novels is 400-800 KB.
I doubt that most people find space limitations are a problem with their Kindle.
Jim
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