How long is the US visa valid? What about visiting relatives visa?

The validity period of the American visa is from the date of issuance of the visa and is valid the following year. Multiple entry visas for one year. The visa for visiting relatives in the United States requires relatives in the United States to send invitations to China. In China, they can get passports, make appointments for interviews, prepare materials, fill out embassy forms and go to the embassy on schedule. You can consult American ACI at any time if necessary.