The aim of the present study was to assess whether long asylum-decision waiting periods were associated with a short- and long-term risk of being diagnosed with a psychiatric disorder in Denmark. The study established a large-scale, individual-level, nationwide dataset combining information on dates of asylum application with register information on psychiatric diagnoses from the post-resettlement phase. Specifically, it aimed to test the hypothesis that longer asylum procedures were associated with a higher risk of psychiatric disorders in general and of specific disorders, especially nervous disorders such as post-traumatic stress disorder (PTSD). The study covers all refugees resettled in Denmark during the period of 1995 to 2016.