God is a god of preparation. He prepares for everything, because preparation is very important. Everything a person does in life without adequate preparation has a high likelihood of not being a success. It is in this way, god prepares you. He prepares you to do great work for the kingdom of heaven.
He prepares you, so you can be the best version of yourself and it does not matter how long it will take you. As long as God is the one preparing you, then you have nothing to worry about, because