Confirmation emails should go out immediately, but I've found that it sometimes takes time for email to be received. I have a test system set to send out emails using my isp's smpt info, and I receive them using an email account that I have with a different provider, and sometimes it takes a while for them to be delivered. If you do a test registration and have an email sent to your own address, you should be able to look at the headers and see where it's getting delayed.
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