lael, The euphoria stage of the affair can last up to six months and some affairs can last any where from 18 months to 2 years or more, depending upon the situation and where your spouse is in the crisis.
I hope I didn't discourage you too much about affairs, but I didn't want you to get your hopes up too much thinking that after 6 months it would be over.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.