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However , two indicators that are recommended to be monitored only once every 4 hours were monitored much more frequently : maternal blood pressure at 0.63 times per hour and vaginal exam at 1.1 times per hour ( see Figure 2 ) . These bits are flipping 10 to the 20 times per second a hundred billion billion times per second . People 's voices vibrate about a thousand times per second . The most frequently monitored indicator was fetal heart rate ( FHR ) : 1.3 times per hour on average compared to the international recommendation of twice per hour . ERIC is searched more than seven million times per month and more than 230,000 times per day .