Z visa application in the Philippines

I'm already here in China and holding a F visa and wanted to apply for Z visa but the official here instruct me to go back to the Philippines to process it there instead here. My employer give they all very best to try to process it here but sadly I should really need to comeback to Phil. They're now so strict when it comes to approving the visa. What do you think if i might go back to the Philippines it will still be process smoothly as long as my requirements are complete. And how many days will it be processed?