How long does it take to find out why the stock price plunge? To be honest, I believe SGX can find out the reason faster, than if it were to ask China GaoXian's management. All it takes is just to find out which parties were responsible for the big blocks of shares being sold, and piece that together. On China Gao Xian's part, there really is no need for a halt, because if the person really wants to sell, what can you do? Unless there is material information that is not being disclosed.