Conjunctivitis can be categorized by the speed of onset into hyperacute, acute or subacute, and chronic. Depending on the severity of the condition, it can be classified as mild, moderate, or severe. Acute conjunctivitis is usually self-limiting, with the condition lasting about two weeks. After treatment with sensitive antibiotics, recovery can occur within a few days. Chronic conjunctivitis is not self-limiting and is more challenging to treat.