Case processing times are available on the USCIS site. You can find out these times by providing the location of the office and the form type. Here are the processing times for naturalization and citizenship applications at the Phoenix field office:
- N-400 (Naturalization): 6.5 to 14.5 months
- N-600 (Certificate of Citizenship): 6.5 to 14.5 months
- N-600K (Citizenship and Issuance of Certificate Under Section 322): 10 to 22.5 months
These times are calculated based on recently concluded cases. Also, the format you see above is in a new format being tested by the agency for many forms. In this test, the first and second figures for an application type are the times for completing 50% and 93% of the cases respectively.