Psychiatrists try to free people from guilt. But there is only one true way to have freedom from guilt. Christ cleanses you and destroys the old sin. Christ buries the sinful life in the grave of baptism. That depends on the person.
Some people learn and obey fast.
Other people go slower. Usually people can be ready for baptism in a short time. He was baptized the same day he heard the truth. They were baptized the same night they heard the truth. He was baptized after 3 days.