Bottom line

USCIS processing times are population-level 80th-percentile windows, refreshed monthly. Match your form, classification, and service center precisely; ignore generic 'average' estimates that don't break out by service center.

Frequently asked questions

How do I read my receipt number?
Receipt format: 3-letter prefix (LIN/EAC/SRC/WAC/MSC/IOE) + 10 digits. The prefix maps to lockbox or service center: LIN=Lincoln/Nebraska, EAC=Vermont, SRC=Texas, WAC=California, MSC=National Benefits Center, IOE=ELIS electronic.
What is biometrics and when is it scheduled?
Biometrics (fingerprints, photo, signature) are required for most USCIS adjustment, naturalization, and EAD applications. USCIS schedules the appointment at your local Application Support Center 4-8 weeks after filing receipt.
What does the USCIS processing-time range mean?
The published range is the time that 50% of cases (lower bound) and 80% of cases (upper bound) take to complete. 'Outside normal processing time' is set at the same upper-bound value — it's the threshold for filing a case inquiry.
How often does USCIS update processing times?
USCIS publishes monthly snapshots. Each refresh re-computes the 80th-percentile window from the prior month's completions; large adjudication-volume swings can move the number materially in a single update.
What's the difference between case status and processing times?
Two different tools: case status reports state changes for your specific receipt; processing times show statistical adjudication windows. They share the egov.uscis.gov domain but answer different questions.

Sources