It all really depends on your age, your health, and what you’re doing to get better. Are you getting enough rest and liquids to help you recover quickly? The symptoms of an upper RTI usually pass in one to two weeks. Lower respiratory infections, like bronchitis and pneumonia, may take a little longer to pass—about two to three weeks on average. Older or immunocompromised patients may take longer to heal. The sooner you get treatment, the better your chances are for a faster recovery.