We require you set your book release date at least 60 days after you approve your final book proofs.
Why? The presale period prior to your book's release is very important. During the period prior to the book's release, Amazon's algorithm gathers data on pre-orders and pageviews to forecast demand for your book. Accurate demand forecasting means Amazon will stock plenty of copies of your book to meet demand.
So It's to your advantage to have a 60-day pre-sale period for your book! Longer is OK, too! For more information on this, click here.