The USMLE is a three-step exam, with each step being taken at different stages of your medical studies. Step 1 exam is a one-day exam which consists of seven 60-minute blocks taken over an 8-hour testing session. Step 2 consists of eight 60-minute blocks taken over a 9-hour testing session. Step 3 is a two-day exam. Day one is divided into 6 blocks of 60 minutes each. The second day comprises of six blocks and candidates are given 45 minutes to complete each one. There are then 13 case simulations, each of which will take between 10-20 minutes.