Quote Originally Posted by Zysets View Post
I just recently added a 60 day time card without having any sort of subscription, and it says I can put in another code if I have one.

Go on Mogstation and check if the "add Game Time Card" option is there, under the "account status" once you log in.
It did, how I understand that is that you can stack a finite amount of game time on one account at a time, incase you for whatever reason want to. I was just more concerned with the application of the time card itself.