I was told by a customer service representative via phone support that my particular block was 24 hours. I cannot speak on the behalf of others, after-all there may be different issues at cause here. For all i know, there may be a 30 day block for certain suspicious activities and a 24 hour block for others.
What if no game stops in my state sell these cards? Then what do i do?
Welcome to my world. The only difference is while I was in queue for chat support, I whipped out my phone and called them up, and NO it did NOT take an hour, it took ONE MINUTE for them to pick up. So please, do not bitch about a service you have yet to try out. As I posted above, the representative told me you need to stop attempted to make payments and WAIT 24 HOURS from your last attempt, and THEN try paying with a card of same country as your ip.
I'll let you know in a few hours if it works, cause i got no option to get a prepaid card - there aren't any in the state that i live in.