Today, we take most of our pictures on our phones. And we see the image instantly. Very few of us, if any, develop the pictures ourselves. However, if you did, you would discover the time-consuming and delicate process required to achieve the desired outcome - a perfectly developed picture.
The photographer takes his time when developing a picture. In the same way, it takes time for God to continue His work in developing one into the image of His Son.
Who are you during this time. Do you have the same patience.