One of the most popular tourist visas is the US B1/B2 visa, which allows for a maximum stay of 180 days Per Entry.
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WHAT SHOULD I KNOW ABOUT THE US TOURIST VISA VALIDITY? The B1/B2 Visa is valid for 10 years after issued, but for each entry, you are allowed to stay in the United States of America only for 180 days Per Entry or 6 months** (at most).
The B1/B2 visa is a multiple-entry visa, which means you can use it to enter the U.S. more than once. There's no set limit to the number of times you can visit the U.S. in a year, and it really depends on the specific circumstances and discretion of the CBP officers who review your case each time you enter.
The short answer is no, you cannot apply for a B-1/B-2 visa on behalf of someone else. The visa application process is a personal one, and the applicant must attend the interview in person. However, as a U.S. citizen or green card holder, you can support your family member or friend who is applying for the visa.
On average, the standard amount is between $5,000-$10,000 sitting in a bank or more. The more money you have in the bank, the better. Furthermore, you must have maintained that lump sum for 3-6 months before applying for the visa. You can present your proof of funds in one of two ways.