It is important to note that the process can span a wide range, from a few months to several years, which can be dependent on a number of factors. One of the primary reasons behind this is the type of form submitted, however, the USCIS provides a tool where you can select your form, form category, and the office that is processing your case and see the estimated processing time based on previous cases. In general, the application for naturalization takes about 5.5 months.