How to change the interview time of American immigrant visa?

Are you a v92 visa? If so, you must go unless you don't have a passport, otherwise you will be notified again in the foreseeable future. If you have another type of visa, then you must have a valid reason to extend it. You must write a letter and fax it to the consulate: 020-38844 12, with your phone number. The consulate will call you. If you want to change it to the time you want, it's not too outrageous. A month or two should be fine, but if it is a few months, I don't think the consulate will agree.

Also, after getting a visa, you can stay at home for half a year. Because the visa is valid for half a year. After more than half a year, the visa is invalid.