How long does severe hypoxia associated with bronchiolitis last?

Wheezing Infant: Bronchiolit describes lower respiratory infection in young children, caused by virus, main symptom is wheezing. Most w/ bronchiolit do not become hypoxic, highest risk are less than 6 mos, history of prematurity or chronic lung disease. When present, hypoxia usual present in early stages of illness. Hypoxia is treated with oxygen therapy that can take several dys to wean. Illness can last 2-4 wks.