Delays have become endemic in all phases of immigration application processing. It could be difficult at times to determine the cause of a delay. In some cases, files may be set aside or misplaced when U.S. Citizenship and Immigration Services (USCIS) has a question or needs more information. In these types of situations, an immigration lawyer may be able to investigate and resolve the problem, allowing processing to continue.
Because delays continue to increase, there is no strict deadline for determining whether a delay has extended beyond a reasonable period. USCIS lists average wait times on the agency website, so those time periods could be used as a starting point to define Naperville unreasonable delays for citizenship.