Game time extensions such as this do not count as new days subscribed and will not affect your subscription counter. The extension will just push your sub expiration date back. The only way to know when and if the time extension has gone through is to know when your sub expires and then check Mog Station to see if it's been pushed back.

Quote Originally Posted by Hasrat View Post
OP, if you haven't applied a subscription and are only playing on the first free 30 days, you seem to be ineligible. If you do believe you are eligible, then, as the notice mentions, it may yet take a couple days to apply to everyone.
The announcement explicitly states that people on the 30 days that come with the starter or complete editions are eligible.