How much poo will you do?
Thinksock / BuzzFeed
That's taking the World Bank's estimate of the average life expectancy in Britain (81.5 years). Worldwide, the figure is 3,640 weeks – 70 years – according to the WHO.
That's taking the ONS's estimate of the median age of the British population (39.7) and the World Bank stat above.
Based on a resting heart rate of 72 a minute and 81.5 years of life (the spuriously precise figure is 3,084,220,800). The normal range is 60 to 100 a minute.