These maps have become far too small and crowded for the 37 day wait before an unoccupied country is deleted. I think it should be closer to 7 or 14. Many times a country you're treated with will go inactive and your stuck until either your treaty expires and you invade or they finally get deleted. I think if you don't log in for 1 to 2 weeks you're probably not coming back. Just in case people are gone for long periods you could set a "vacation mode" which a player would manually set as a timer for how long they would be gone, this would only extend the amount of inactivity before deletion that their country would have.

Make it 28 or 30 days max

7-14 is a bit too short