A: Normally, L visa can be extended once, and for 30 days.

25th Oct 2014, the shanghai entry-exit bureau focus on the tourist L visa extension, they might ask you to provide more document to prove you are a real traveler, for example, hotel booking receipt, extended return flight ticket. And right now, more and more tourist visa extension application was been denied if you have lot of visa in your passport before and looks not like a normal traveler. So now, L visa extension success rate is only about 20%, before it's almost 95% success rate.