1 billion seconds?
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Scientifically: It depends on how fast you count . . . most people count at about one number per second, so it might take 1 billion seconds . . . unless you paused or took breaks. Or: A LONG TIME
If you count one number per second, and never stop to sleep or eat or anything, it will take over 31 years.
1 billion seconds 16666666.67 minutes 277777.7778 hours 11574.07407 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.