Sally gave a great answer earlier - the average Days on Market will really depend on the area and price range you are looking in. Inventory of homes priced under $300k is very tight, and can go very quickly, within 1-4 days when priced right. In the mid-upper price range, aggressively priced homes can still go very quickly, but it's not as unusual to see a listing sit a bit longer, maybe 30 - 60 days or longer.
I hope this answer helps. If I can be of any other help, feel free to reach out to me. My contact information is below.
True Blue Realty