Query – LastLogon > 60j

select SMS_R_SYSTEM.ResourceID,SMS_R_SYSTEM.ResourceType,SMS_R_SYSTEM.Name,SMS_R_SYSTEM.SMSUniqueIdentifier,SMS_R_SYSTEM.ResourceDomainORWorkgroup,SMS_R_SYSTEM.Client 
from SMS_R_System 
where DATEDIFF(dd,SMS_R_System.LastLogonTimestamp,GetDate()) > 60