First: have you actually read a kepub book yet? Time remaining is calculated on what the Kobo thinks your average reading speed is.. if all you've done so far is flipped through a few books, the Kobo might think you're a really fast reader. the estimate should be much more accurate after a few hours of actual reading.
The Remaining time to read estimates are affected by the bugs/deffective design that affects Kepub reader and books that do not have a ToC entry for every file. You can fix a book by opening it in the Calibre editor, edit the table of contents, remove all the existing ToC entries, and generate a new ToC from files. You then have to rename all the ToC entries that did not automatically pick up the correct heading, (but this is only cosmetic.)
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