Visa issued to those who are invited to China for visit, study, give lectures, business, conduct science and technology, sports exchange, and short-term training, internship, and participate in various trade fairs, exhibitions and other activities; the intended duration of stay is limited to no more than 180 days.
For more information： www.visaforchina.org

The stay time of transit visa free foreigners in China has been extended from 72 hours and 144 hours to 240 hours (10 days):
https://en.nia.gov.cn//n147413/c178106/content.html