If a person tests positive, how long does it take to complete contact tracing both inside and outside our facility?

On any given day, when public health has a positive test come back from the lab, they are usually in contact with that person within hours. If the workplace is able to provide staff lists of who was at work with that person, it is extremely helpful to public health to let people know that they can start self-isolating at home while they are monitored for symptoms.