After the I-129F has been approved, the foreign fiance has 4 months
from the time of approval to obtain the K-1 visa at the U.S. consulate
in the foreign country.
If a K1 visa is issued, the visa will allow the foreign fiance to
enter into the Untied States within 6 months of the issuing date. The
K-2 visa holder must enter the U.S. within one year after the K-1 arrives
at the U.S., but a K-2 visa holder may not enter the U.S. prior to the K-1.
Once in the United States, the fiance has 90 days to get married.
Immediately after marriage, the alien with K-1 visa must apply for adjustment
of status for green card.