How long does it take to apply for a green card in the United States after physical examination, and can I return to China during this period?

Physical examination takes about a month, so it is best not to go back to China. If the Immigration Bureau still has questions about the applicant's materials, it may have to be interviewed.

The official name of the green card is "permanent residence permit", which is used to prove the legal right of a foreigner to live and work in the United States for a long time. American green cards also have a similar function to passports. When you enter the US Customs, you can show your green card without a visa. This card, which represents permanent residence status, was green at first, then adopted other colors, and changed back to green after 20 10. A green card is a plastic card the size of a credit card with photos and fingerprints on it, and some personal information is recorded on it. The green card is valid for 10 year. After the expiration of the validity period, you need to apply for a new card from the Immigration Bureau. The United States and European countries have different management agencies for foreigners' residence. The issuance of visas and the issuance of residency in the United States are different departments. American embassies abroad only issue visas, and the above-mentioned period of validity refers to the period of validity of entering the United States rather than the period of residence. The length of residence is determined by the local American immigration officials. For example, the visa on the passport is valid for one month, but the immigration officer of the US airport customs can give the applicant the right of abode for half a year or just seven days.