How many times do foreigners have to pop up windows?

Usually only once.

General nucleic acid results and personal ID information are sent to the community, and the pop-up window is cancelled in about two hours.

If the content you pop up is "The epidemic is no small matter, everyone * * * defense! As you may visit or pass through epidemic risk areas in the near future, Beijing Health Bao is temporarily unable to confirm your health status related to epidemic prevention, according to Beijing,,,,, ". In this case, please contact the local community directly to arrange nucleic acid adjustment for you.