Hello,
Symantec does not recommend more than seven (7) locations per group when using Location Awareness as this can affect the execution time on how long it takes the SEP client to process and ultimately connect to a valid location where all conditions have been met.
From the Symantec Endpoint Protection Manager (SEPM) side, having more than seven locations per group can also degrade SEPM and database performance as the number of policies to track increases (by a minimum of five) per each location.
Reference:
Best Practices for Symantec Endpoint Protection Location Awareness
http://www.symantec.com/docs/TECH98211
Hope that helps!!