I am a US citizen living in China. I will soon be issued an invitation letter for a one-month business visa (F) in China, and must leave the country to get the visa and return to China. Is it possible to get this visa at the Chinese embassy in Bangkok? Is it possible to get an express service to pick it up the same day - and how much will it cost?

When will the embassy be closed around the new year (will it be open on December 30? and when will it open again in January?)? Thanks!