Has anyone accomplished the Legendary Legacy achievement?

I guess you would have to really play all day. One generation a day. that is a life span from birth to death. One day, I don't know if I have that much time. so how many hours a day would you have to play to play a generation in one day. birth to next generation.
My sim just turned to adult. so when he marries, will see how long after their baby is born how many hours it takes in a day to get to the next generation.
Meaning that baby grows up gets married and has a baby. How many hours of game play in one day.