If my memory serves me right, the time ratio of this secret kingdom is half an hour outside = 3 years inside. Therefore, there are some errors in the temporal aspect; 1000 years for humans to invade would mean 52 million years inside the kingdom. And as the ghost aunt said, 100,000 years would be equivalent to almost 2 years for humans.
COUTINHO_OP
If my memory serves me right, the time ratio of this secret kingdom is half an hour outside = 3 years inside. Therefore, there are some errors in the temporal aspect; 1000 years for humans to invade would mean 52 million years inside the kingdom. And as the ghost aunt said, 100,000 years would be equivalent to almost 2 years for humans.