eb5917e9_shable_Mashup_Response_Caching__Cache_Entry
[0] 3. [Event] A Presto administrator turns caching on for all RSS and Atom mashables, but does not configure an expiration period. UserA adds a block to a mashup in Wires for the Yahoo Financial RSS mashable and previews the results. [Cache Entry] 
The response from Yahoo is cached with an expiration of 5 minutes, taken from the global default expiration period.
Configuring Mashable/Mashup Response Caching
Cache Entry