Authorize.net-How long after authorize can I wait to capture?

I am setting up my website now but am working on payment options. Since we sell a lot of items that go up for preorder we often will put an item up for pre-order and then ship as soon as it's in stock. I know legally shipment is required within 30 days of charging a card. I know a good way to reduce chargebacks and to be fair is don't charge the card until shipment. 95% of the items are expected to be shipped within 2 business days.
One thing we're looking at doing is doing an authorize of the card and then capture just before shipment time. I earlier posted about costs and if I'm correct the charge for an authorize and later capture is that there is a complete charge at authorize time and at capture time the transaction fee is just charged a 2nd time.
The biggest concerns we have is about deadlines. Is there a certain time period after authorize until you capture such as a certain number of days of weeks?
Also, for security reasons, I know at authorize time AVS is used and the card is authorized but at capture time is this done a 2nd time or would that be necessary? Is it likely safe waiting a period such as 2 weeks to capture?
Thank you for help with the above questions.

These are really questions you should be asking your AuthorizeNet rep.

Yes, you should be asking your rep those questions.

Their documentation states that Captures must be done within 30 days; otherwise the authorization expires.

I used a different shopping cart (until recently) and used authorize.net. I used to authorize and then within 15 seconds was doing a charge on the same card.

Pretty fast.