In general it appears to be about 3 to 5 days with Bordetella. In some dogs it can lead to pneumonia or more serious signs. Cough suppressants can be used to control the cough and antibiotics may be necessary for stubborn infections or to try to stop the spread of the bacteria in multiple dog households. The intranasal vaccine is pretty fast acting, providing some protection in as little as 5 days. The injectable version of the vaccine may provide longer immunity, though.
Some vets use both to get maximum protection.
We don't use either one routinely but give the intranasal vaccine to our patients who will be exposed to groups of dogs. Inc. Opinions expressed are those of Dr. Richards.