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You count from AD then to BC
If you count an average year to include 365 days then 85 years is equivalent to 29'200 days. If you count in leap years where every four years 366 days make a years that add 29'221 days.
If you counted 1 number per second, it would take 220 years to count to 7 billion.
If you counted 1 number per second, it would take at least 220 years to count to 6.9 billion.
That depends on how fast you count. If you can count about 3 numbers every second then it will take about 10 yrs. Of course you really can't count 3 numbers per second for ten years without stopping to sleep and eat so it would take much longer to "really" do it. 32 years if counting properly,sleeping,eating and drinking.