Our book listings are updated practically around the clock. We have numerous staff members working on this in a daily basis. They are auditing all lists regularly to make sure there are no errors or missing books.
As publication dates can change etc, we try to limit when we post new books to four months in advance. So if you are viewing the site in August, any books with publication dates in December should be added to the site. We add new books as soon as they have a publication date and are available for pre-order.
We're happy to add any book though, no matter how far out it is. So if you want us to add a book not coming out for another year and it's available for pre-order, let us know via the contact form on an authors page, and we'll get that added.
We also monitor any upcoming books and their publication dates, and if one changes prior to publication, are alerted and update it in our system.