Game Time Card

well alltough i had more then 80 left on my game time i bought 3 gtc to add to my collection.
First one went fine but when i wanted to add the second one i got a message that i can add only 180 days of gameplay.
My question is the number that i add where i got the 180 day message from is it still valid or did i just trow away 26€ away?

thanks

For some reason SE only allow you to accumulate 180 days paid time, so simply hold on to the other cards until you get down to <120 days left (each card buys 60 days time) and add another.