Our Satellite Rateboards are currently set to cache dynamically generated pages for one hour, so rate changes will take about that long to update, and perhaps up to 119 minutes depending on when they were last loaded before the cache updated.
If you really need to, you can force the page to refresh them right away by adding “?refresh=1″ to the url of the rates page and loading it. ( eg. http://www.example.com/rates.php?refresh=1 or http://www.example.com/rates/?refresh=1 )
SiteControl sites may cache the files longer since the dynamic CMS content is also cached for a configurable period of time on top of the rateboard caching.