Just thought I would share. How far back you can see event data.
If anyone is wonderirng ever, to confirm when you started receiving data on your ADAudit server, just navigate to the following path:
"Program Files\ManageEngine\ADAudit Plus\logs\wrapper.log"
At the top is when the ADAudit service first started. So we could have data from that date, if the Audit Policies are configured perfectly in that date