We filed a K-1 Fiance Visa petition with USCIS (California Service Center) on 11/07/2017 and received the USCIS approval notice on 5/24/2018:
K-1 Visa Client Approval
USCIS Filing Date: 11/07/2017
Received I-129F Approval Notice: 5/24/2018
Processing time from Filing with USCIS to Approval: 6 months, 17 days
I-129F USCIS I-797 Receipt #: WAC1890044722