You may remain in the US until your I-94 expires as long as you are still employed by the employer that petitioned for your R visa. If you leave the US you must get a new visa stamped on your passport to re-enter the US. This should not cause any problems if you decided to apply to become a permanent resident.
No, visas are used soley to enter the US
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A valid visa stamp is only required to enter the US.
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Your visa stamp is only for entry to the US; it does not govern your status or length of stay while here. That is governed by your I 94. So, unless you need to travel, no need to do anything until close to the time your I 94 will expire. However, with regard to PR, that takes a while, so best to get started early.
You do not need to extend your visa if you are not leaving the U.S. However, you will need to take steps to extend or adjust your status before 2015.
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