The process is fairly fast over all. You'll submit your sign-up to DH, then it may be set up in a matter of an hour or so... Or flaged for verifcation. Apparently DH has had some issue with not-nice ppl signing up and trying to rip them off. If your acconut is flaged for verification it can take up to 2 business day I believe.
If you've signed up and don't have access to your stuff yet, you can allways drop support a line and ask what the stuatus of your account is.
hope this helps to clear things up