Visits must be 90 days or less, and travelers must meet all requirements.
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When you enter the U.S., a customs officer will give you authorization to stay in the the country for up to six months. If you'd like to stay for longer, you may be able to apply to extend this for up to one year.
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.
If you came to the United States on a nonimmigrant visa and you want to extend your stay you must apply with USCIS before your authorized stay, denoted on your admission stamp or paper Form I-94, expires. It is recommended you apply well in advance of your expiration date.
You must apply for a visa (B2 visa) if you want to stay in the U.S. for more than 90 days, no matter what the reason. You must apply for a visa (B1 visa) if you are traveling to the U.S. for employment or business purposes involving remuneration, even if not staying longer than 90 days.