you have two clocks one for the day and one for the block. When you take a break use your watch to know how much time is left. You get 45 minutes of breaks, but if you complete the tutorial early, that time is added to your break time. Go to the nbme website and go ahead and take the same tutorial that appears before the test on and you should have around an hour of break time. I took a 5 minute break between most sections and a 25 minute lunch, but you can use your hour (or 45 minutes if you do the tutorial the day of the exam) as you see fit, ie 10 minutes after 2 sections etc. Hope that helps.