Is it possible for a French national to get a 90 days stay Chinese visa in Japan?

Hi, you can request one for 90 days when you submit your application. But it is ok too if you get one with 30 days, because the tourist L can be extended within China twice, each with 30 days. If you are now in Japan, you are required to apply through a travel agency. So, better contact any of them for the latest information.