After Obtaining a K1 Visa
Once your fiancée is awarded a K-1 visa, he or she will receive the passport submitted to the US Embassy or Consulate containing the fiancée visa, as well as a sealed packet of documents, including all evidence submitted. Your fiancée should not open this packet, and should present it to a Department of Homeland Security (DHS) official upon entering the US.
Once your fiancée receives these documents, he or she will be able to enter the US one time within six months after obtaining a K1 visa. In some extreme circumstances, your fiancée visa lawyer may be able to negotiate to extend this six-month deadline after obtaining a K1 visa. As soon as your fiancée enters the country, the 90-day countdown begins, during which time you must be legally married for your fiancée to apply for LPR status.