hi,

i am traveling to china in august of 2011 and i wanted to know when should i turn in my application for my chinese visa since it is only good for 3 months, because i plan on applying for a single interest visa. i also wanted to know, since i plan on flying into to shanghai, but i wanted to visit beijing to go to the great wall of china either by train or plane, should i still apply for a single entrance visa or a double entrance visa.
your assistance is greatly appreciated.