I think you are asking the wrong question. If any property is priced right, it will sell within 30 days in any location and in any market. In this spring market in Seattle, and especially, popular neighborhoods like West Seattle, we are seeing multiple offers within a day on well priced properties.
I see you are outside the country, so I wonder if you are looking at a property to buy or if you are selling. If you are buying, a long market time, indicates the property has been overpriced. Once it is priced correctly, it should sell quickly. Often, when a property has been on the market a long time, it gets lower offers and actually sells below market value, so buyers can take advantage of that situation.
The above paragraph is good for you to know if you are a seller. If you are selling a West Seattle property, just know that the key elements are price, condition and location. You can change the price, improve the condition, or adjust the price based on the location. On my web site http http://:www.buyandsellseattlerealestate.com
, you can find some great current market statistics on the Market Insider tab.
The key information you need to make a decision, is the activity you are getting. I always figure if I am getting several showings a week, the property is in the range of selling. If I get a dozen showings and no one back twice, or no offers, I know the price is too high for the current market competition.