<prompt> According to ICD 10, the symptoms of schizophrenia should persist for how long for its diagnosis?2 months1 month6 months2 weeks  <response>: According to recent ICD 10, It is 1 month and according to DSM 5 it is 6 months to diagnose schizophrenia Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 365 