I think I'm going to be ineligible for this mount, even though I've maintained an active subscription since ARR launch and plan to for the foreseeable future. My last renewal was on March 30 for 180 days of game time, that puts a renewal at September 26th, but I got the free day for the data center move + the 15 days for the preferred world bonus. That puts my renewal out to October 12th with a total of 87 days of paid subscription during the period (the rest ineligible time)

It isn't possible to renew early and I don't know if game time cards can be added while you have a recurring subscription.