A generation is the time from the birth of a person, to the birth of his or her child. This can be anything from about 15-100 years.
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2 years and 2 weeks
There were ten generations between Adam and Noah. This rounds out to about 1100 years. It should be noted that the lifespans and fertility periods of these individuals were incredibly long. Adam was 130 years old when he fathered his first son and Noah fathered his first child at 500.
2 years=24 months
2000 years.
Figure on one every 25 years (average as family spacing changes with culture) which gives you four per century.