I am invited to work as a volunteer at an orphanage in Fuzhou for two months. Can I get 60 day visa

I want to apply for a tourist vis for 60 days to work at the Hidden Treasures Orphanage at Fuzhou, as I have been invited to do so. I was there for a week in January 2012 and want to go back to help with the children. Can I apply for a 60 day tourist visa?