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To start, you need to know that a “generation” is one complete life cycle. A monarch can complete its life cycle in only one month. That's how long it takes for an egg to become an adult butterfly. A monarch butterfly generation is very short! Let's count monarch generations and see how long it takes to reach a billion butterflies. To start, we'll assume that one mother butterfly lays 300 eggs. If they all survive how many children would the mother have? There are four human generations are in this picture. Can you find the child, parent, grandparent and great-grandparent? If each person became a parent at age 25, each human generation would be 25 years.   This Season Teachers Kids Orientation Registration Search Copyright 1997-2008 Journey North. All Rights Reserved. Questions or comments? Contact us.