The short answer is, the length of time cannot be determined. The longer answer is, depending on whether the petitioner is a US Citizen or Permanent Resident, and depending on whether the petitioner is filing for his/her spouse, parent, adult married son/daughter, adult unmarried daughter, unmarried child under age 21, or sibling, the length of time for a USCIS decision could be as short as 2 months, or as long as years. But USCIS might also have reasons for the delay, such as background checks, investigations, etc.
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