The Communication Time-Out variable on the Account Settings page is defaulted to 1000 ms.  During an audit, if a response has not been received back during this period for a specified IP address, FMAudit Onsite will no longer attempt any communication for that IP address.

Setting this value too high, or with a large number of Unicast IP's may unnecessarily extend the time it takes to complete an audit.

i.e. Timeout =  1000ms (default setting)
192.168.1-254.1-254 = 254*254/20*1000/1000 seconds = 54 min for 64,516 IP's
i.e. Timeout = 250ms
192.168.1-254.1-254 = 254*254/20*250/1000 seconds = 13.5 min for 64,516 IP's