Delusional Disorder requires delusions of at least how long?

• A. ≥1 month
• B. ≥6 months
• C. ≥2 weeks
• D. ≥3 months

Answer: (A)

Durations of delusional symptoms are the deciding factor here. Delusional Disorder requires that delusions be present for at least one month, with functioning not markedly impaired outside the impact of those delusions. This one‑month threshold helps distinguish it from Brief Psychotic Disorder, where symptoms are shorter than one month, and from schizophrenia-spectrum conditions, where a broader pattern of symptoms and longer illness duration are typical. So, the delusions must persist for at least a month to meet this diagnosis. Shorter durations (like a few weeks) point to Brief Psychotic Disorder, while much longer durations with additional psychotic features would steer evaluation toward other schizophrenia-spectrum categories.