I have been accepted to an academic program in Beijing from August 5th to August 27th. I then have a job that starts in Guangzhou on September 1st. The job in Guangzhou will help me secure a work visa starting on September 1st. The issue is time. The academic program says I should get a tourist visa. Once the academic program ends, I am to go to Guangzhou, where my job will help me process a work visa via Hong Kong. But if the tourist visa only lasts 30 days, then won't my visa expire before I have the chance to get a new one. Another option might be to get a business visa for the academic program. In that case, I won't be pressed for time. But will it be okay for me to upgrade from a business visa to a work visa once I get to Guangzhou on August 28th? Any advice would be helpful Thank you!