You can "reset" the time left in chapter by doing a search for ";ReadingTimeReset" from within a book. When you do the search, your Kindle should show no results, but when you go back to your book instead of showing the time left in chapter it will say "Learning Reading Speed". After a few pages, it will start reporting an estimated time left again.
In my experience on both my PW2 and Voyage, it seems like my reading speed will be reported fairly accurately for a while, then for no reason that I can see, it will suddenly seem to cut the estimate in half and report a much lower time than it will actually take me. Doing the search for ";ReadingTimeReset" will correct the estimate for awhile.
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