K1 visa: How often does Administrative processing usually take/How Long did AP take for you?

In the email sent to us, they said that it usually takes 90 days but sometimes it could take more and it's coming up on 90 days for us since my fiancee had her interview at the embassy in which she was approved. Honestly, I have little faith that we're going to hear back from them at the 90 day mark. How long does AP typically take?