Duration of each stay is clearly shown on a China visa, which refers to the maximum number of days the holder is permitted to stay in the mainland of China each time and is counted from the next day after entry.
The granted duration of stay ranges from 7 to 180 days. For transit visas, the duration of stay is 7 to 10 days. For a regular single-entry tourist visa, it’s often 30 days. The longest durations of stay for X2, S2, Q2, and J2 visas are 180 days. If you receive Z, Q1, S1, J1, or X1 visas, you may find that the stay duration shown on your visa is 000. In this case, you need to apply for a temporary residence permit from a local exit and entry administration within 30 days after entering China. During the validity of your residence permit, you can stay in China for any number of days as you wish.
Travelers need to keep in mind of the time limit in order not to overstay. Overstaying is against the Chinese laws and regulations, punishments such as fines or even expulsion will be made.
In need of an extended stay, applicants should apply for it at the Exit and Entry Administration of local public security at least 7 days before the allowed stay duration runs out. See China Visa Renewal and Extension.