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..
An incubation period refers to the amount of time between the moment a person or animal is exposed to a bacteria or virus and the appearance of the first symptoms.However, an incubation period can also refer to the length of time necessary for oviparous animals to develop while inside the egg.epatitis A can have an incubation period of up to 50 days, while for rabies, the incubation period can be as long as one year. Diseases with shorter incubation periods include the common cold, dengue hemorrhagic fever and cold sores or herpes, with an average of 10 hours.