How long is Xuzhou epidemic area generally closed?

During the epidemic, some buildings must be closed to prevent the spread of the virus. The building was closed due to the epidemic in the community. Can we not go back? The residential corridor can only be closed for 7- 15 days. If there is a secret in the corridor, it is 15 days. If it is indirect, it is seven days. What else is there? Generally, it is 14 days, depending on the local epidemic control situation. Generally 14 days can be unsealed, but it depends on whether there are new cases in the closed community. If there are 1 positive cases within 14 days and the nucleic acid test is negative, it can be solved!