Twice a day is enough I guess
On another forum I noticed that some people are also not getting it through account section. Maybe somebody will find a solution to trigger this request on account section.
This a dev reply to the same problem on ESO beta forums:
Hey there, http://forums.elderscrollsonline.com/profile/xellonnub18_ESO?. Just to confirm, have you checked your junk mail or spam folder? Sometimes those emails will appear there. It's also possible that a filter or firewall could be blocking the email.
We recommend adding email@mailer.elderscrollonline.com to your trusted email address list. It you're still not receiving that email, feel free to contact our http://help.elderscrollsonline.com/app/ask so that they can look into the issue for you.