Heath, I hope it is more than "just for the sake of asking the question," because if they flip tomorrow you need to have a plan.
I will probably buy mostly slightly in-the-money puts and I will emphasize the QQQ and SPX LEAPS - Jan '04 and Jan '05.
You never know how long they will stay with a market bias. Sometimes it's just for a week. It has been as long as about three years. If you took an average, I think it's about four months. But I think it's best to assume that you'll be in the position for at least several months.
Larry