Do there is a time limit to enter US after getting H4B visa?

My wife has got visa some one month back. She doesnt like to come here for another 4-5 months.

Answer:
Nope, She can come in anytime before her Visa expires.

Say if you have H1B visa that's valid until Jan 2010, and your wife must have for the H4 expiring the same time, So she can come and go whenever she decides within the time period.
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