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An editor came in from dmoz today, how long till I know if it's been accepted?
Unfortunately, the fact that an editor looked at your site doesn't always mean that it is about to be accepted or rejected. There are other reasons why editors look at sites in the queue.
It's not listed yet, are acceptions or denials immediate?
Sometimes they are and sometimes not. Depends on the editing style of the editor, whether the site was submitted to the appropriate category, and many other factors. If you don't see it listed in the next few days, then I'd guess that your site is in the "sometimes not" category - or that your site was reviewed and denied.
SUPPOSEDLY all servers are within two weeks of up-to-date.
Note that "not being listed" is not the same as "being rejected" -- there are many reasons an editor might take no action, or take no immediately visible action, or even move the site to some other category you didn't expect, after visiting a site.
(On the other hand, note, of course, that you can't always see editors in your logs. Many very-active editors will use multiple tabs or windows, and cut-and-paste URLs so they don't have to waste time going back to the editing page.)
In other words, at best you may not ever know it's rejected, and you may not know it's been accepted for months.
This isn't a problem for editors, who can choose to re-review any site (whether or not it's been reviewed or acted on before). And it really isn't a problem for webmasters either -- what would you do differently if it were rejected? or if it were accepted? So it really doesn't matter.