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In the documentation for the dashboard, it says
"
RSS Feeds
The status history chart, iteration/sprint burndown chart, and the what's new feed are all available in RSS format. To subscribe to a feed, click the RSS button in the top right corner of a widget to get the URL. Copy and paste this URL in any RSS reader. The chart feeds contain images of the graphs and are updated daily.
"
Is it possible to increase it to more than once a day?