For Alzheimer's disease, the time range is

• A. Time: 5 to 15 min.
• B. Time: 20 to 45 min.
• C. Time: 60 to 90 min.
• D. Time: 90 to 120 min.

Answer: (B)

Testing duration for Alzheimer’s assessment should balance gathering enough information with keeping the patient engaged and accurate. A focused cognitive screen plus clinical interview typically fits into about twenty to forty-five minutes. This window allows you to cover memory, attention, language, visuospatial skills, and daily functioning, while minimizing fatigue and anxiety that can skew results in older adults with dementia. Too-short a session may miss important deficits; too-long a session can tire the patient and reduce reliability. Exact timing can vary by setting and patient, but staying within this range is commonly recommended.