When is the elder scrolls online account going to be back up from maintenance?

If you reread the email you received it will tell you what days the beta was available for. Also this is not the place to be posting questions concerning the Elder scrolls online beta please go here

For any further inquiries

http://help.elderscrollsonline.com/app/ask/session/L3RpbWUvMTM5MDc5NDc0Mi9zaWQvZ2h4LW9vTGw%3D

What he said. There are specific annnounced periods when the closed beta servers/forums are up.

If you are invited to the next Beta wave, you will get an email with all the needed info.