There is no limit to the number of times you can apply for a U.S. visa after rejection. However, that doesn't mean that you should apply over and over again without changing anything in your application.
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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.
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).
As long as your status is still valid and you continue to follow all immigration regulations, you can continue to remain in the U.S. even if your visa has expired. The status does not end when the visa expires.
There is no minimum balance requirement for your bank account, however, based on the experience of others we recommend anywhere between $5,000 to $10,000 will be sufficient.
If you overstay the end date of your authorized stay, as provided by the CBP officer at a port-of-entry, or United States Citizenship and Immigration Services (USCIS), your visa will generally be automatically be voided or cancelled, as explained above.