Getting your visa to teach abroad in China differs in terms of cost, process, jurisdiction and processing time. These differences could be because of the country your are applying from or even the city you are applying from. It's strange but true.
In most cases you, or someone on your behalf, has to take the official Chinese visa application in to the Chinese Consulate in person and someone has to go and pick it up in person. This explains partly why there are always line-ups.