Each life insurance policy has what is called "underwriting requirements" based on your age and the face amount of the life insurance policy you are applying for.
Non medical life insurance (policies that have smaller amounts of life insurance and do not require that you take an exam) will go into effect and start your life insurance coverage much faster than life insurance policies whose underwriting requirements include a medical examination, testing of your urine and/or blood, and a review of your medical records.
Some life insurance companies offer instant issue life insurance policies which will ask you some health questions when you get your quote and you can apply online for your life insurance in a matter of minutes. If approved, you may choose to start your life insurance coverage the same day.