It is instant peace, for most of us any way. Every death is a unique birth back into the world of spirit. If some one died tragically like a car wreck or they were murdered. It might take a while before they know what happened. We always have angels to help us understand what happened and what is next. We don't always choose to move into the light. Some spirits may feel so worried about life here, they just want to hang around and see how we are coping. Maybe they don't feel complete with some one here and want to do that.