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You may take the USMLE Step 1 exam a maximum of three times within a 12-month period. Your fourth attempt must be at least 12 months after your first attempt, and at least six months after your most recent attempt.
Comprehensive Basic Science. In addition to the 15-minute tutorial, this exam has a new optional 15-minute break, which increases its total session time to 4 hours, 42 minutes. 184. 4 hours, 27 minutes. Comprehensive Clinical Science 184 4 hours, 16 minutes. CLINICAL DIAGNOSIS EXAMINATION. Introduction to Clinical Diagnosis 125 2 hours, 30 minutes.