There is an incubation period for conjunctivitis, and the length of the incubation period varies between different types of conjunctivitis. Several common types of incubation periods are as follows: 1. Hyperacute conjunctivitis with gonococcal infection has a very short incubation period, usually only a few hours. The incubation period is usually only a few hours, and is very contagious, usually because the patient has a genital gonococcal infection and does not wash his hands after touching his genitals and rubbing his eyes, which leads to gonococcal infection of the conjunctiva, and the symptoms of conjunctivitis are evident 2-3 hours after rubbing the eyes. 2. Bacterial conjunctivitis, usually with an incubation period of about 3 days, is transmitted through contact, such as sharing personal hygiene products such as washcloths and basins with the patient. The incubation period is usually slightly longer, reaching 5-7 days, but the incubation period for individual types of viral conjunctivitis can be shorter, such as epidemic hemorrhagic conjunctivitis, where the incubation period is usually only 1-3 days.