Read this: During the period of North–South division, Nanjing remained the capital of the Southern dynasties for more than two and a half centuries. During this time, Nanjing was the international hub of East Asia. Based on historical documents, the city had 280,000 registered households. Assuming an average Nanjing household had about 5.1 people at that time, the city had more than 1.4 million residents.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): How long was Nanjing the capital of the Southern dynasties?
more than two and a half centuries