To Whom It May Concern:

I am writing to inquire about seeking an extension for a double entry visa(possibility of) which was only used for only one admittance in lieu of the two. My visa is soon to expire and I will not be able to travel to China again within the dates of visa expiry, however, since having paid the fee for two entries is there a way to request a date extension at my local consulate,etc.? Also, is it possible to apply for a visa that is valid for the life of the passport as with US/other nations visas?