Well... here is a link...
http://www.amazon.co.jp/%E3%83%95%E3...123093&sr=8-26, so I guess 609...
Yes, the second part of the novel won't be available until 20th August.
And no, it hasn't always been like this, it has only been like this once, "The end of day by day" was the only other novel split in two parts.
You welcome! :P