I want to know the answer to the following question:
How long was the national mourning for the quake victims to last?
All the background I'm provided with is that "It was the first time that a national mourning period had been declared for something other than the death of a state leader, and many have called it the biggest display of mourning since the death of Mao Zedong.". Is that enough to answer the question?
Answer: no