You should know that the average time a home is on the market can differ depending what type of property, what price range it is in and the condition. You can get a general amount of time which has been under 90 days but there are properties that are selling quickly such as bank owned and soem staying on teh market alot longer. The most important thing you can do is to have a Broker Price Opinnion completed on your home. This should tell you what you house is worth now and the approximate time to sell it. You should receive what it is worth, what you should ask and what price it will proabily sell for. I hope i could help.

That's a pretty broad question. I did an unscientific look at the properties that sold during the month of August 2009 and found an average of 84 days. However, that doesn't tell you much of importance. Cheshire County is a large area and home sales in Keene are not entirely comparable to home sales in Winchester or Fitzwilliam, for instance. Also, the type of house you are interested in makes a big difference- a large luxury home may linger while a more compact family home sells quickly, or a fixer upper may have to wait for the right handyman while something in move-in condition doesn't.
If you are considering selling a home ask your agent for a written CMA, including comparable sold and on the market properties. Seeing a few homes in your area that have sold recently and that compare to yours will give you best idea how quickly and at what price you can expect to sell.
If you are considering buying it isn't quite as easy, but you can ask your buyer's agent for similar help- what price and days on market info is for homes in the specific area, style, and size you want. Look closely at the market history- it will tell you a lot.
Good luck!