Image expired on cfchart

The image expired prompt can be stopped (or reduced) by following the guidelines below taken from CFCHART HELP

1. Stop the CF server.
2. Open <cfinstallpath>\lib\webcharts3d.xml
3. You can increase the timeout for keeping the graphs in the cache by editing the minTimeout and maxTimeout attributes:
   <?xml version="1.0" encoding="UTF-8"?>
   <server image="PNG" cache="Memory" style="font-weight: bold;">minTimeout="5000" maxTimeout="30000"</span>....