I'm trying to subscribe to a WoW annual pass using iDeal (Direct Debit) as payment method. However at the payment option I still see 1 - 3 - 6 months subscriptions and not for a year.

Do I just need to have a total of 12 months worth of game time on my account to do this? How does it work? Cuz I did read the FAQ but I'm unsure how exactly the money thing would work. Would it just count as two 6 month subscriptions and that'd be it?