He may stay until the date on his I-94. HOWEVER, at the time he applied, he had given a length of time he had planned to visit. His credibility for future visas depends in part on his truthfulness. For example, if he had said he wanted a 6 week visit in order to get his first visa and then stay 6 months, he will not be seen as to be as good a risk for a future visa as if he stayed the 6 weeks he initially requested.
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