It is the question of taking the Bible as literal in regard particularly to evolution. Grass didn't take long to grow. Bees didn't take long to grow. They took originally just as long as they take today. If you sow a seed this year, it will grow and become a young tree next year.
Man is made of animal essence, vegetable essence and mineral essence.
Suppose you have prepared all the material necessary to build a house. It doesn't take long to build the house itself. To collect the material may take time, but once you have the materials the building itself doesn't take much time. Likewise, the animal, vegetable, and mineral kingdoms were all created over perhaps millions of years. All the materials were there.