Provided you sent your request code to register |at| vorpx com and the system can ‘understand’ your e-mail and verify the key request, an automatic reply is sent within a few minutes.
There is an issue with G-Mail since some time though. Many mails to G-Mail addresses apparently get delayed for several hours. I can only assume that to be some weird anti-spam measure or something similar on Google’s end. So especially if you use a G-Mail account, please have some patience.