Brief psychotic disorder ⁠— according to the classifications of mental disorders DSM-IV-TR and DSM-5 ⁠— is a psychotic condition involving the sudden onset of at least one psychotic symptom lasting 1 day to 1 month, often accompanied by emotional turmoil. Wikipedia

The Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision describes brief psychotic disorder based primarily on duration of symptoms. DSM-IV defines brief psychotic disorder as an illness lasting from 1 day to 1 month, with an eventual return to the premorbid level of functioning Wikipedia Disambiguation

Period of psychosis whose duration is generally shorter, is not always non-recurring, but can be, and is not caused by another condition Wikidata