hwIpSessIfCfgArpFailTimes is an Integer32 from 2 to 11 specifying how many consecutive ARP detection failures are allowed before an IP-Session user is considered gone, defaulting to 5, with the description noting a value 121 restores the default (though the syntax range tops out at 11, so this appears to reference the related interval object's convention). Admins tune this to control how tolerant the device is of transient ARP failures before tearing down a user's session, balancing false disconnects against stale-session cleanup speed. For example, an admin on a network with occasional ARP packet loss might raise this from the default 5 to reduce premature session teardowns.