Thanks for your support!
We're allowed 50 'hits' on the server every 30 seconds. Each nation counts as two hits in my code (don't know why yet), so that's a max of 25 nations in 30 seconds. If you put in more than 25, you get blocked from doing more hits for 15 minutes.
It would be good to add a timer. The code could split the list into chunks of 25 nations, then send them out every 30 seconds. That would comply with site rules.
I'll work on that at some point. Though anyone else is welcome to post how they would do that!