It depends on the person but a few weeks to about a month.
Cervical - this usually pertains to the individual's neck or to the female's cervix.
Thoracic - The thoracic is located on an individual's chest area in which the ribs connects to in order to protect the human's organs.
Lumbar - The lumbar area is located in the lower area of an individual's back
Probably the last one. It's the least realistic way to make your body healthy. If you are going to do exercise and make yourself healthy, friends would be helpful in that process and exercising is definitely a good way to be healthy.