I have an L visa that is expiring but want to extend.

Hi,

I entered china from Vietnam with a regular L (dutch passport). Afterwards I got an extension of one month. Now that it is expiring I was thinking of extending it again for another month. My question is, Is this possible? I have been told by some people that since July the first its not possible anymore. So in short I have an L, I extended once already. Can get another month extension? if yes how long would this take? (because vary from place to place)