https://www.uscis.gov/policy-manual/volume-12-part-d-chapter-3
An applicant for naturalization has the burden of establishing that he or she has complied with the continuous residence requirement, if applicable. Generally, there are two ways outlined in the statute in which the continuity of residence can be broken:[9]
The applicant is absent from the United States for more than 6 months but less than 1 year; or
The applicant is absent from the United States for 1 year or more.
An officer may also review whether an applicant with multiple absences of less than 6 months each will be able to satisfy the continuous residence requirement. In some of these cases, an applicant may not be able to establish that his or her principal actual dwelling place is in the United States or establish residence within the United States for the statutorily required period of time.[10]