A BlockBuy link can be open for up to 29 days to give you time to make your link successful. :) If your link reaches its estimate in that time period, your order will go to production. If your link does not reach its estimate, your order will not go to production, and the people who ordered will not be charged.
We'll do our best to open as many BlockBuy links as we can, but please note that this is a new service, and in an effort to make each link as successful as possible, some links may be delayed to improve their performance. :) As you experience success with BlockBuy, you'll be given more opportunities to open new links in the future.