How long will it take for my listing to propagate to all the “other” third party websites?

While the MLS is active or “live” the moment we submit the listing, the other sites only populate this data on a cycle that happens every so many hours so that is why it is not instantaneous. We do also have RSS data feeds that we submit data through on a daily basis for many other real estate portals such as Trulia, Zillow, and soon, Buyerskey.com (coming soon!)