I agree with Ian about there being no "normal" marketing time. If I knew what subdivision you are in and some basic information about you home, I could calculate inventory in the market of comprable properties and be able to give you a reasonable idea.
New construction always impacts. Today's buyers do not want to "Fix-up" for the most part, they want to be able to move into the home. So if you are competing against lots of new construction, you need to make sure your house shows equally as well.
If you go to my web site there is a market snapshot you can sign up for and it will show you real time what is going on in your market. You can also find tips for getting your home ready to sell.
If I can be of assistance, please feel free to call or e-mail me.

The latest statistics (January 2008) indicates average days on the market in our area is 105 days. The way your home is marketed to the general public and how well it shows once the buyers get there can greatly influence the days on the market...

There is no "normal marketing time" for anything in this market. If someone tells you otherwise, find another Realtor.

There are many variables to consider such as the condition, location, square footage and use of the home, then the abilty of possible buyers to purchase...then the added special treat of a buyer finding insurance.