Hi, I have obtained X2 visa (double entry) in China and have to leave in middle of November.

In that case, it looks like after I enter PRC again, I will then need to leave the country within 30 days, and then I can come back with my second entry and stay for another 30 days. I heard that some people can go to Anzhenman office to get their passport stamped as exit/entry, rather than really having to leave the country. Is this really the case for X2 type too, or would I have to actually fly out?

And secondly, would it be possible to extend X2 type again within the country?