The duplicate listing interval is a great way to tell the software when to merge two listing data points into one. This is often enabled and used to combine data to make the information more accurate, so that if a home is de-listed and re-listed in a time period of your choosing, it shows as the same data point.

To set the time period that you would like to treat as the same listing and combine data points (if applicable) first you'll click on the System Settings option in the dropdown under your name.

In the center of the dialog window that opens, you'll see the duplicate listing interval box. The default is 0, which means it doesn't combine and duplicate address listings. Changing this number tells the software to combine any listings with the same address if they have expired/withdrawn and re-listed in that number of days.

In the box, click in front of the 0 and type in the number of days you'd like to set as your new Duplicate Listing Interval.