Below is a spreadsheet with the number of sales and listings in the City of Fairfax each month for the las 2.5 years. The September numbers show that 18% of the homes on the market in Fairfax City sold. This implies a 6 month market for the city. I always hesitate to say that for the Fairfax City numbers because it is such a small sample size due to Fairfax City being such a small market.
It is interesting to note the Fairfax City market lags the Northern Virginia market this past month as it typically does. Also note that the market sold at twice the rate it did in September 2007 when only 9% of the homes sold.