How long does it take to update and maintain Hubei health code system?

Three days. Health code is based on personal health data, which is declared online by residents through health registration system, and compared with relevant data of COVID-19 epidemic situation to generate personal two-dimensional code. It takes three days to update and maintain the health code system in Hubei province, and the health code is updated every three days in the case of green code. At least the boarding of health codes in turn can be postponed within the validity period, otherwise it will become yellow codes, but the regulations on health codes are different in different regions.