The current combined United States Citizenship & Immigration Services and Department of State processing times are averaging:
K-1 Fiancee visa = 4-7 months and varies with the USCIS Vermont and California Service Centers.
CR-1 visa and IR-1 visa = 8-10 months
Green card = 4-5 months and varies with the demand at the local USCIS office serving your area.
Processing times vary month to month