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There is no such value. The whole point of EPUB is that the page layout is variable, depending upon your chosen font face, font size, margins, and line spacing.
The closest you can get is to count the number of words or characters and then divide by a fixed number of words or characters per page to get an approximation of the number of pages a paper book would have, but you have to choose the divisor arbitrarily, since different font sizes and page sizes yield different words per page in paper books.
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