For human population growth, how long did it take to grow from one billion (1800 AD) to two billion (around 1927)?

Answer

123 years

The global population took only about 123 years to jump from one billion to two billion, reaching that mark around 1927, illustrating compounding acceleration.

For human population growth, how long did it take to grow from one billion (1800 AD) to two billion (around 1927)?
populationgrowthmodelExponentialdynamic