{
  "form": "I-539",
  "slug": "i-539",
  "last_updated": "2026-08-17",
  "status": "ok",
  "processing_time": {
    "avg_lower_months": 9.6,
    "avg_upper_months": 12,
    "min_months": 0.5,
    "max_months": 13.2
  },
  "office_aggregates": [
    {
      "office_code": "NBC",
      "office_name": "National Benefits Center",
      "lower_months": 0.5,
      "upper_months": 2.5,
      "aggregation_basis": "both_endpoint_average",
      "source_rows": 2,
      "publication_date": "2026-08-17"
    },
    {
      "office_code": "SCD",
      "office_name": "Service Center Operations",
      "lower_months": 10.8,
      "upper_months": 13.2,
      "aggregation_basis": "both_endpoint_average",
      "source_rows": 15,
      "publication_date": "2026-08-17"
    }
  ],
  "offices": [
    {
      "office_code": "NBC",
      "subtype": "139A-OTH",
      "subtype_info": "All other change of status applications",
      "lower_months": 0.23,
      "upper_months": 2.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2026-06-21"
    },
    {
      "office_code": "NBC",
      "subtype": "139B-OTH",
      "subtype_info": "All other extension of stay applications",
      "lower_months": 0.69,
      "upper_months": 2.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2026-06-21"
    },
    {
      "office_code": "SCD",
      "subtype": "139A-B",
      "subtype_info": "Change of status to B nonimmigrant",
      "lower_months": 7.5,
      "upper_months": 9,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-12-18"
    },
    {
      "office_code": "SCD",
      "subtype": "139A-FMJ",
      "subtype_info": "Change of status to F or M student or J exchange visitor category",
      "lower_months": 8,
      "upper_months": 10,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-11-06"
    },
    {
      "office_code": "SCD",
      "subtype": "139A-H",
      "subtype_info": "Change of status to H4 dependents",
      "lower_months": 10.5,
      "upper_months": 13.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-08-01"
    },
    {
      "office_code": "SCD",
      "subtype": "139A-L",
      "subtype_info": "Change of status to L dependent",
      "lower_months": 14.5,
      "upper_months": 15.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-05-21"
    },
    {
      "office_code": "SCD",
      "subtype": "139A-OTH",
      "subtype_info": "All other change of status applications",
      "lower_months": 12,
      "upper_months": 15.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-05-31"
    },
    {
      "office_code": "SCD",
      "subtype": "139AC-H",
      "subtype_info": "Change of status to H4 dependent with I-765",
      "lower_months": 7,
      "upper_months": 9,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-12-08"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-B",
      "subtype_info": "Extension of stay for B nonimmigrant",
      "lower_months": 8,
      "upper_months": 9.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-11-23"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-FMJ",
      "subtype_info": "Extension of stay for F or M students and J exchange visitor category",
      "lower_months": 6,
      "upper_months": 7.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2026-01-20"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-H",
      "subtype_info": "Extension of stay for H4 dependents",
      "lower_months": 10,
      "upper_months": 12.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-08-25"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-L",
      "subtype_info": "Extension of stay for L dependents",
      "lower_months": 8,
      "upper_months": 11.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-09-27"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-OTH",
      "subtype_info": "All other extension of stay applications",
      "lower_months": 10,
      "upper_months": 15,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-06-19"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-T",
      "subtype_info": "Extension of stay for T nonimmigrant",
      "lower_months": 21.5,
      "upper_months": 22,
      "publication_date": "2026-08-17",
      "service_request_date": "2024-11-06"
    },
    {
      "office_code": "SCD",
      "subtype": "139B-U",
      "subtype_info": "Extension of stay for U nonimmigrant",
      "lower_months": 20.5,
      "upper_months": 23,
      "publication_date": "2026-08-17",
      "service_request_date": "2024-10-17"
    },
    {
      "office_code": "SCD",
      "subtype": "139BC-H",
      "subtype_info": "Extension of stay for H4 dependents with I-765",
      "lower_months": 4.5,
      "upper_months": 8.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-12-25"
    },
    {
      "office_code": "SCD",
      "subtype": "139C",
      "subtype_info": "Reinstatement to student status",
      "lower_months": 14.5,
      "upper_months": 16.5,
      "publication_date": "2026-08-17",
      "service_request_date": "2025-04-25"
    }
  ],
  "source": "USCIS",
  "attribution": "ImmigrationTimes.org/forms/i-539/"
}