In 4.15.07 the maximum time frame for running custom reports via the UI is 15 days.
The Private Cloud version of Apigee software allows this to be extended to 31 days by following these steps:
1. Add the following line to <install_root>/apigee4/conf/ui/apigee.conf: apigee.feature.enableForceRangeLimit="false" 2. Restart the the UI 3. Log back into the UI (you may have to clear your browser cache to get the new behaviour)