Prior auth can take a while if the insurance wants it to. I've had it go so far that my pdoc had to present a case before another doctor (team of doctors?) and wait for approval based on how badly I really needed the drug. I've also had it go really fast when it was for a generic that wasn't on the formulary. Once they kept denying my pdoc without reason and she sent the same appeal in 5 times. They approved for life after that; I think they were sick of her. If it gets into a reivew the pdoc has to show why no other cheaper options will work for you.