There is no fixed timeframe for when kittens will develop pneumonia after choking on milk; it depends on various factors, such as the severity of the choking, the kitten's constitution, and its immune system. Generally, if the choking is mild and treated promptly, it may not lead to pneumonia. However, if the choking is severe and not treated in time, pneumonia symptoms may appear within days to weeks.
If a kitten exhibits symptoms such as difficulty breathing, coughing, sneezing, drooling, and loss of appetite, it may have pneumonia caused by choking on milk. In this case, it is necessary to take the kitten to a veterinarian immediately for diagnosis and treatment.
