Simply put, "Days-on-Market" tells you how long the active properties currently for sale, in aggregate, have been on the market (a.k.a. "time on market"). Said otherwise- "of the active listings currently available for sale - how long have they been for sale?"
The Days-on-Market number that you see here on AnthonyLum.com is a "cumulative" number. So what does that mean? Sometimes listing agents will pull a listing from the active market and re-list the property in the near future - maybe a couple of weeks or months down the road. This is a common action for an agent to take if a property has been on the market for an extended period of time or if the property will have its price reduced. Frequently, this also resets the days-on-market number back to "0 days" in the local MLS search. By re-listing the property, it can appear to be "new" in the local market because new buyers in the market may not have seen the property previously. But, that doesn't really tell you want the true "days-on-market" value is in that market.
To correct for that, we calculate "Days-on-Market" as a cumulative number, which means if a properties leaves the active market and is relisted again within a 90-day period, we assume that they property was never really "off the market" - more like "it was taking a break."