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The estimates I read regarding long one has to wait for the naturalization interview after submitting the N-400 Application for Naturalization Form (mirror) vary from 4 months to 14 months:
Does there exist some more reliable estimates? Does the USCIS give some expected waiting times, as they do for some other processes?
It really depends on which field office you end up at. USCIS doesn't provide more specific time estimates any more. They used to provide estimates per office, but AFAIK they stopped doing that.
https://egov.uscis.gov/processing-times/ gives some estimate for the N400 processing time for each USCIS field office, but no breakdowns for each step of the N400:
I am guessing that the end of the N400 processing is the oath ceremony day but I'm not sure.
https://egov.uscis.gov/processing-times/more-info explains how to read the two numbers:
Estimated time range: This column lists case processing times as a range for select forms and locations. The lower value of the range is the time it took us to adjudicate 50% of our cases. The upper value of the range is the time it took us to complete 93% of our cases. See below for a description of how these ranges are calculated.
Historical data can be found on https://egov.uscis.gov/processing-times/historic-pt but isn't broken down per USCIS field office.
Announced on March 29, 2022: https://www.uscis.gov/newsroom/news-releases/uscis-announces-new-actions-to-reduce-backlogs-expand-premium-processing-and-provide-relief-to-work the USCIS aims at reducing the N400 processing time to 6 months by the end of FY 2023.
Some websites or phone applications provide their own time estimates. E.g.:
Some websites track applicant cases, e.g.:
