The Step 2 CK exam contains 370 questions and spans 9 hours of testing (including an hour of break time). It is administered as eight, 1-hour "blocks" of 46 questions each. You will be able to skip back and forth between test questions, but only within a particular block. Once you leave a block (or time expires for that block), you will not be able to return to the questions of that block.
Step 2 CK questions are NOT grouped by subject within a block. For example, you won't find a section devoted to pediatrics. This random ordering of items presents you with a unique challenge. You must switch from thinking about one subject, such as surgery, to another, such as obstetrics, without skipping a beat.
In total, you will have 45-60 minutes of "break" time depending on whether you choose to complete the 15- minute tutorial at the start. You can "add" to your break time by finishing a block early. Please note, however, that finishing blocks early does not add to your total "test time," which remains constant at 8 hours. That means that you can't add time to one block by finishing another block ahead of time. You should take breaks only BETWEEN blocks; leaving the testing area DURING a block will be noted as a testing irregularity.