All the Kobo devices share the same database design. The desktop app as well. Don't know about the Android based devices and apps.
What you are after is in the Event table. When a book finished books have a row with EventType=5 is added, or the EventCount is updated.
You might also need to look at EventType=1020 and 1021 rows. These seem to be open and close records for the books.
Times are recorded in the ExtraData column. Unfortunately, it is a BLOB and I don't know how it is encoded.
I have posted comments the different event types before. A search should find the list I have.
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