DD4T caching config. See http://albertromkes.com/2012/04/07/dd4t-and-caching/
<add key="CacheSettings_CallBackInterval" value="5" />
<add key="DD4T.CacheSettings.Page" value="5" />
<add key="DD4T.CacheSettings.Component" value="5" />
<add key="CacheSettings_CallBackInterval" value="30"/>
<add key="DD4T.CacheSettings.Page" value="3600"/>
<add key="DD4T.CacheSettings.Component" value="3600"/>