Organic chemistry final exam, 2 hours and 45 minutes in and they make the "you have 15 minutes remaining announcement".

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Organic chemistry final exam, 2 hours and 45 minutes in and they make the "you have 15 minutes remaining announcement". You turn the page to see a full page of questions remain, not including the ones you flagged to go back to earlier. The rush of adrenaline, the stress, and the copious amounts of caffeine would all contribute to an increased heart rate. My R-R interval is 8 boxes. Calculate the number of 0.04s boxes there would be between R-R intervals on an ECG trace. Write that number in your answer.