What is the minimum duration of continuous disturbance required for a schizophrenia diagnosis?

• A. At least 3 months
• B. At least 6 months
• C. At least 1 month
• D. At least 12 months

Answer: (B)

The duration criterion for schizophrenia is that signs of disturbance must be present continuously for at least six months, and within that period there must be at least one month of active psychotic symptoms (such as delusions, hallucinations, or disorganized speech). This six-month window ensures the illness is persistent and distinguishes schizophrenia from shorter-duration conditions like brief psychotic disorder or schizophreniform disorder, which have shorter timeframes. The requirement of at least one month of active symptoms within that period confirms a meaningful, active phase rather than only prodromal or residual symptoms.