eb5917e9_shable_Mashup_Response_Caching__Cache_Entry
[0] 6. [Event] A Presto administrator sets the default caching expiration period for all RSS and Atom mashables to 3 minutes. [Cache Entry] 
As RSS or Atom mashables are run, their responses are cached for 3 minutes, except for Yahoo Financial which is cached for 1 minute.
Configuring Mashable/Mashup Response Caching
Cache Entry