How long will it take Xuzhou to turn yellow after receiving the text message?

Xuzhou usually turns yellow on the night of receiving the text message.

According to the requirements of epidemic prevention policy, the Su Kang code "yellow code" is given to the personnel in the closed control area and the control area where the epidemic area is not defined as a medium-high risk area, and the "yellow code" is given to the personnel who were with the case seven days before the onset.

Therefore, when residents find that their Sukang code turns yellow, they need to check their recent trajectory to find possible risks.