Taking advantage of the new 10 year visa treaty between USA and China, I applied, and was issued Chinese visa (multiple entry, category Q2). However, I only got approved for 120 days per stay, while I requested 180. My sister, who applied together with me, was approved for 180.
I know I can apply for an extension at the local security bureau, but it seems like one would need to repeat that every time one enters? In the case that I apply for a completely new visa, requesting 180 days, would my old (120 days) visa be cancelled if the new application is not approved, or would I continue to be able to use it? Is there another way I can have the duration of stay extended?