
You normally need to have lived continuously in Norway for the past three years on permits that qualify; some groups (such as people with protection/asylum-based permits or their family members) need five years.
Norway's permanent residence permit is built on time spent in the country on temporary permits that count toward permanent residence. For most applicants the requirement is three years of continuous residence, while people whose permits are based on protection (asylum), derived refugee status, or family immigration with such a person generally need five years.
The years must be unbroken and based on permits that qualify. Long absences from Norway can interrupt the residence period, so check how your time abroad is counted before you apply. Your decision letter for each permit usually states whether that time counts toward permanent residence.
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