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2 billion seconds
4.5 billion seconds.
A billion is 1 followed by 9 zeroes, or 1,000,000,000. 27 billion billion billion would be 27 followed by 27 zeroes, or 27e27. In long form: 27,000,000,000,000,000,000,000,000,000 In words, twenty seven octillion.
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
According to the US "short scale", a billion is 1,000,000,000 or 1 x 109.So 125 billion would be 125,000,000,000.(on the European long scale, there would be 3 more zeroes added to that)