In an effort to provide more historical App usage reporting data for admins, Google recently extended the time limit for application usage activity reporting data provided by the Admin SDK Reports API from 6 months to 15 months.
Note that this change does not apply to the application usage activity reports in the Admin console Reports UI, nor does it apply to the Audit reports API or Admin console Audit UI, which will remain at the current 6 month limit.
The limit extension began when this feature was officially implemented on September 2, 2014, so the full 15 month (450 day) history will be available on May 30, 2015, with an earliest available record date of March 6, 2014. For example, if you attempted to pull an Apps usage activity report today via the API, you would get a little over 7 months worth of data.
Release track:
Rapid release and Scheduled release
For more information: