It usually takes around 3 working days but that depends on the place where they are going to deliver the visa but since your fiancee is just around manila so she will have her visa after 3 days.For those who are in provinces takes 5 working days.Goodluck on her upcoming interview!!!God Bless.
If you Approved on the Same day of interview , Visa prepared on the next working day but it takes 3 days to 1 week to be in your hands, it depends how far you lived from US Consulate. Good Luck.