Measuring how long drugs remain in your system is based on the drug's half-life, or the amount of time it takes a drug to leave your body. The half-life is best described as the amount of time it takes the liver and kidneys to filter and break down the drug within your bloodstream.
A person is not usually contagious during the norovirus incubation period. People infected with norovirus are usually contagious from the moment they begin feeling ill to at least 3 days after recovery. Some people may be contagious for as long as 2 weeks after recovery.fter approximately 1 to 2 days, norovirus symptoms can appear. This period between the norovirus transmission and the start of norovirus symptoms is known as the norovirus incubation period..
In people, the incubation period (the time between initial contact with the virus and onset of the disease) generally ranges from two to eight weeks. In rare cases, it can vary from 10 days to 2 years. The incubation period is shorter in children and in people exposed to a large dose of the rabies virus. The dose of virus depends on the size, severity and location of an animal bite or scratch. In animals, the incubation period depends on the species of animal.