The Italian version of the last Harry Potter made a good record.
The book was in the bookstores at 00:00, and I found at quarter past midnight a pdf with the first five chapters (scanned and proofreaded: there was no ebook source to de-DRM).
The next part was up about an hour later.
The funny thing is that there were lots of teenagers queueing (or better, having the strange clot-like formation Italians call "queue") in front of the bookstores since the morning to wait for the special nightly opening, waiting to grab a copy of the book.
At 10:00 in the morning the book was in the local supermarkets at 20% off...
But most of those early buyers din't read it at all, they just waited for the movie.