ZohoCRM Audit Log

ZohoCRM Audit Log

How far back should I be able to go in the Audit Log in Zoho?  

I have the option to use a calendar and select any date, however each time I run it the data seems restricted to the past 3 months. 

There is no documentation that I can find that states a limit.  The following link 'Check Availability and Limits' is broken from the Monitoring Audit Logs page in the help guide:
http://localcms2.zohocorp.com/zoho/crm/helpnew/erutaef321.html#audit-logs