To clarify this a bit, there are two prompts. Both show open books. One has books that have not been read very far and offers to mark them as unread. The other shows books that are nearly finished and offers to marks them as read. The books must also have been in that state for a while and not touched.
I don't know what percentage reads are used for either of two checks. And I don't know how long they have to be sitting in that state for a book to be a candidate for this prompt.
The prompts are shown periodically. I'm not sure of the interval. It might be monthly or when new books meet the criteria with a minimum time between the prompts. The timestamps above are when the prompts were last shown and should mean they will not be shown until sometime after that time is reached.
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