It's been my experience that kml files update in less than 24 hours,
probably closer to 12.

On Aug 14, 2:41 pm, Benjamin <[email protected]> wrote:
> Hope I'm posting in the right place- if not, please redirect me.
>
> For accessibility reasons I'd like to display the same map data I've
> developed for Google Earth in Google Maps on my website. Problem is,
> Google Maps loaded the kml file and generated the map once... but the
> kml has since been updated and Maps still loads old data- changes are
> reflected in Google Earth but not in Maps.
>
> The only way I've found to display the most current data is to change
> the file name/link every time I update the KML file.
>
> Any idea how long Maps caches the kml information? Any way to let Maps
> know the data has been updated or otherwise force a refresh?
>
> Maps page (displaying older version of 
> KML):http://www.moapavalleytrailstudy.org/maps/interactive_map/
> Earth page (pointed to same KML file, but showing current 
> version):http://www.moapavalleytrailstudy.org/maps/map_site_details/
>
> Can't find anything regarding this issue in Maps KML support 
> page:http://code.google.com/apis/kml/documentation/mapsSupport.html
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