Hi there @gazmx,
thanks for reaching out about this !
Gift cards, when valid for use, are considered to be a payment method like any other payment method available for a user.
This means, if you have already redeemed it and your account status is Premium, you'll be able to enjoy your account anywhere in the world as long as you stay a Premium subscriber.
If by any change, the gift card period has ended while you're still abroad, your account will revert to Free and you'll still be able to use the same account (as a Free user) for up to 14 more days before it stops.
I hope this clarifies things a bit better.
Let me know if you have any further questions 🙂