The "R" in visa type indicates that you are a "regular" not "diplomatic" traveler.
Class B1/B2 is the status on which you will enter the US. A B1 visitor visa is meant for business visitors, and a B2 status is for visitors for pleasure/tourism.
The visa does not indicate how long you can stay in the US. This is determined by the officer who inspected you at the port of entry, and is indicated on the I-94
Generally, the maximum time allowed in the US as a B1/B2 visitor visa is 6 months.
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