How long does it take to get visa?

You shoudl apply for a China business visa from the China Embassy in Iran with the documents below:
1. Your passport valid for more than six months before expiration and at least two blank page in it.
2. One complete application form glued with a recent passport-size photo
3. invitation leter from isie conference
4. round-trip air ticket
It usually takes 4 working days, but you are advised to apply for the visa about one month in advance of your date of entry into China.