Help with some subscription question :O

Hi,
Right now im just able to pay for one month of subcription for FFXIV ! but in like two days im going to be able to pay for the whole 90 days of subscription :o
I want the voidal mount :o
I wanna know if I can pay for 30 days now, and later (next week) on I can pay for the other 60 days :o and get my voidal resonator. Or if I had to wait until my 30 are off so I can renew my membership to pay for the last 60 days... If thats the case I think ill wait :3 until I can pay the 90 days in advance :o
Help o.o!

You will not be charged while you have a subscription active. Each time you are billed or activate a code, you will have a subscription going.

So, in short, no. If you pay for 30days, then you have to wait 30days to get the stuff for 60days.