Like for an e-check? That can happen at any time. If you look at the details, I believe it will say "expected" clearing date, but it also lists a range of several days. Yep, I happen to have one and just checked. It says "Pending until December 23", then in details it says "eCheck estimated completion: Dec 23, 2013 - Dec 26, 2013." Hasn't cleared yet.
I think if you don't have your account verified 'enough', they hold even regular payments until delivery of the item or somesuch. In that case I don't have an answer for you.