what are the requirements for F visa to China and is it possible to get it and how long it will takes?

You need your original passport, Visa Application Form, one passport-size, Invitation Letter or Confirmation Letter of Invitation from China, round-trip plane ticket, Hotel reservation, Previously used China visas.
Generally, you will be granted an F visa if you provide the documents the visa officers require. The processing time needed is 4 working days, express service and rush service are also available.