Paraguayan passport and living in Paraguay.

It takes at least 10 working days if you mail your application to China embassy in Brasilia. If you go in person, it takes 7 working days. You'd better submit application in person because you will be responsible for the loss or damage of your passports and other documents if you send application by post. You need to contact the embassy in avance if you want to need express service, there is no express service for mailed application. It costs R$70,00 for single entry visa, you can pay the HSBC in Paraguay, but you need to pay service fee of the bank.